check.js

// TASK 1 A
console.log("hi");
for (let i = 0; i <= 3; i++) {
  console.log(i);
}

// TASK 1 B
for (let i = 1; i <= 3; i++) {
  console.log("Hello");
}


// TASK 1 C (I)

for(let i = 1; i<=6;i++){
    console.log(i);
}

// TASK 1 C (II)

let str = "";
for(let i = 1;i<=5; i++){
    str = str + 'A';
    console.log(str);
}

// TASK 1 C (III)

// let count = 1;
let mtr = "";
for(let i = 1; i<=5; i++){
    mtr = mtr + i;
    console.log(mtr);
};

// TASK 1 C (IV)
for(let i = 1; i<=10; i++){
    console.log("3 x "+ i + " = "+ 3*i);
}


// TASK 1 D
// the three parts of loop are 1 :- Initializer 2:- Condition and 3:- Counter/Update statement
// Initilizer is used to initialize a statement
// Condition is basically used to check the condition that until when we need to run our program
// counter is used to update the statement.


//TASK 2
for(let i = 1; i<=10; i++){
    console.log(i);
};

//TASK 3
let jsString = "JavaScript";
for(let i = 1; i<=6; i++){
    console.log(jsString);
}

//TASK 4

for(let i = 1; i<=5; i++){
    console.log("EmployeeId :: "+ i)
}

//TASK 5
for(let i = 1; i<= 11; i++){
    let cube = (i * i * i);
    console.log("number = " + i + " cube = "+ cube);
}

// TASK 6
for(let i = 1; i<=10; i++){
    console.log(i + " " + i*10 + " " + i*20);
}

// TASK 7
for(let i = 1; i<=8; i++){
    console.log(i + " " + (i + 10) + " " + (i + 100) + " " + (i + 1000));
}


//TASK 8
for(let i = 1; i<=5; i++){
    // xStr = xStr + i;
    // console.log(xStr);
    console.log("X"+i);
}

//TASK 9
for(let i = 1; i<=5;i++){
    console.log("A"+i + "B" + i);
}

//TASK 10

for(let i= 1; i<=5; i++){
    let sq = (i * i);
    console.log(sq);
}

// TASK 11

let aStr = "";
let cStr = "";
for(let i = 1; i<=5; i++){
    str ='A' + i;
    cStr = cStr + str;
    console.log(cStr);
}

// tASK 12

let countHere = 2;
for(let i = 1; i<=5; i++){
    console.log(i + " + " + countHere + " = " + (i +countHere))
    countHere++;
};

// TASK 13
let str1 = "";
let mainStr = "";
let firstNum = 1;
let secondNum = 2;
for(let i = 1; i<= 4; i++){
    
    str1 = 'XY' + firstNum + (++firstNum);
    mainStr = mainStr + str1;
    
    // firstNum = secondNum;
    firstNum ++;
    // secondNum++;
}
console.log(mainStr);



// task 14
let str2 = "";
let mainStrr = "";
for (let i = 1; i <= 5; i++) {
  for (let j = 1; j <= i; j++) {
    str2 = "@";
    mainStrr = mainStrr + str2;
    // console.log(mainStr)
  }
  mainStrr = i + mainStrr;
}
console.log(mainStr);


// TASK 16

for(let i = 1 ; i<= 10; i++){
    console.log(i*3);
}

// TASK 17

for(let i = 1 ; i<= 10; i = i+3){

    console.log(i);
}

// TASK 18
for(let i = 5; i>=1; i--){
    console.log(i);
}

// TASK 19
let numStr = "";
for(let i = 5; i>=1; i--){
    numStr = numStr + i;
}
console.log(numStr);



// $$$$$$$444$$$$$$$$$$$$$$$$$$$$$$$$$ if else %%%%%%%%%%%%%%%%%%

// TASK 1
let n = 21;
if(n%2 == 0){
    console.log(n);
}else{
    console.log(n+1);
}

// TASK 1 A 2
let num = 17;
if(num%6 == 0){
    console.log("Divided by 6");
}else if(num % 3 == 0){
    console.log("Divided by 3");
}else if(num %2 == 0){
    console.log("Divided by 2");
}else{
    console.log("Nither divided by 6 nor by 2 and 3");
}

//TASK 1 A 3

let str = "";
for(let i = 1; i<=5; i++){
    if(i % 2==0){
        str = str + "K";
    }else{
        str = str + "J";
    }
}
console.log(str);

// TASK 1 A 4

let isPrime = 16;
let count = 0;
for(let i = 2; i<isPrime; i++){
    if(isPrime % i == 0){
        count++;
    }
};
if(count == 0){
    console.log("Prime")
}else{
    console.log("Composite")
}


//TASK 2

let numm = 9;
if(numm<= 0){
    console.log("Negative number");
}else{
    console.log("Positive number");
}

// TASK 3
let multipleOfTen = 990;
if(multipleOfTen % 10 == 0){
    console.log("Multiple of 10 ");
}else{
    console.log("Not a multiple of 10")
}


//TASK 4
let mNum = 10;
let nNum = 10;
if(mNum  >nNum){
    console.log("Greater")
}else if(mNum < nNum){
    console.log("Smaller")
}else{
    console.log("Equal")
}

//TASK 5
let num = 16;
for(let i = 2; i<= 5; i++){
    if(num % i == 0){
        console.log("YES " + i);
    }else{
        console.log("No " + i)
    }
}

//TASK 6

for(let i = 1; i<=15; i++){
    if(i%5 == 0){
        console.log("Hello");
    }else{
        console.log(i);
    }
}

// TASK 7

for(let i = 1; i<=10; i++){
    if(i%2 == 0){
        console.log(i + " : Even")
    }else{
        console.log(i + " : Odd")
    }
}

//TASK 8

for(let i = 1; i<= 17; i++){
    if(17% i == 0){
        console.log(i)
    }
}

// TASK 9

for(let i = 1; i<=10; i++){
    let srq = (i * i);
    if(i%2 == 0){
        console.log("Square of " + i + " = " + (i * i) + " Even")
    }else{
        console.log("Square of " + i + " = " + (i * i) + " Odd")
    }
}

// TASK 10
let marks = 0;
if(marks >= 75){
    console.log("Good");
}else if(marks >= 50){
    console.log("Average")
}else{
    console.log("poor");
}

//TASK 11
let n = 56;
if(n >= 90){
    console.log("Grade " +"A");
}else if(n>=75){
    console.log("Grade " +"B");
}else if(n>=50){
    console.log("Grade " +"C")
}else{
    console.log("Grade " +"D")
}

//TASK 12
let str = "";
for(let i = 1; i<=5; i++){
    if(i%2 == 0){
        str = str + 'X';
    }else{
        str = str + 'Y';
    }
}
console.log(str);

//TASK 12
let str = "";
for(let i = 1; i<=5; i++){
    if(i%2 == 0){
        str = str + 'Y';
        console.log(str);
    }else{
        str = str + 'X';
        console.log(str);
    }
}
// console.log(str);


// TASK 13
let n = 3;
str = "";
for(let i = 1; i<=n; i++){
    if(n== 1){
        str = str + "A";
    }else if(n == 2){
        str = str + "AB";
        break;
    }else{
        str = str + "ABC";
    }
}
console.log(str);
console.log(str);

// TASK 20
let sum = 0;
let n = 9999;
for(let i = 1; i<= n; i++){
    let lastDigit = Math.floor(n%10);
    sum = sum + lastDigit;
    n = Math.floor(n/10);
}
console.log(sum);


// TASK 19

let str1 = "";
let str2 = "";
let n = 9;
for(let i = 1; i<=n; i++){
    if(n%i == 0){
        str1 = str1 + i + "#";
    }else{
        str2 = str2 + i + "#";
    }
}
console.log("Divide : "+str1 + " " +"Not Divide: "+str2)


// // TASK 15
// let str = "";
let n = 6;
// for(let i = 1; i<=n; i = i+2){
//     str = str + i + "#";
// };
// console.log(str);

// TASK 16

let str1 = "";
let n = 9;
for(let i = 1; i<=n; i++){
    if(i%2 == 0){
        str1 = str1 + "+"+ i;
    }else{
        str1 = str1 + "-" + i;
    }
};
console.log(str1);

// TASK 17

let str1 = "";
let str2 = "";
let n = 6;
for(let i = 1; i<=n; i++){
    if(i%2 == 0){
        str1 = str1 + "+"+ i;
        str2 = str2 + i;
    }else{
        str1 = str1 + "-" + i;
        str2 = str2 - i;
    }
};
console.log(str1+ " "+ " " +str2);


// TASK 20
let sum = 0;
let num = 9999;
for(let i = 1; i<= num; i++){
    let lastDigit = (num%10);
    sum = sum + lastDigit;
    num = num - lastDigit;
    num = (num/10);
}
console.log(sum);



// $$$$$$$$$$$$$$$$$$$$$$$$$ STRINGS $$$$$$$$$$$$$$$$$$$$$$$$


// // TASK 15
let str = "";
let n = 9;
for(let i = 1; i<=n; i = i+2){
    if(i%2 == 0){
        str = str + "#" + i;
    }else{
        str = str + i + "#";
    }
};
console.log(str);

task 2
let str = "hello world";
if (str.length > 5) {
  console.log("Long");
} else {
  console.log("Short");
}

TASK 3
let str = "Hello, world! This is a test string here is a m.";
let count = 0;

for (let i = 0; i < str.length; i++) {
  if (str[i] === "m") {
    count++;
  }
}

console.log("Number of m's in the string: " + count);

TASK 4
let str = "x+y+xy+4x=7";
let countX = 0;
let countY = 0;

for (let i = 0; i < str.length; i++) {
  if (str[i] === "x") {
    countX++;
  } else if (str[i] === "y") {
    countY++;
  }
}

console.log("Number of x's in the string: " + countX);
console.log("Number of y's in the string: " + countY);

TASK 5
let str = "cdeghBannb";
let indexes = [];

for (let i = 0; i < str.length; i++) {
  if(str[i] == "a"){
    console.log("a at index : " + i)
  }else if(str[i] == "b"){
    console.log("b at index : " + i)
  }
}

TASK 6

let str = "Javascript";
let newStr = str.substring(1);

console.log(newStr);

TASK 7
let str = "zoom";
let newStr = "";

for (let i = 0; i < str.length; i++) {
  if (str[i] === "z") {
    newStr += "x";
  } else {
    newStr += str[i];
  }
}

console.log("New string with 'z' replaced by 'x': " + newStr);

let str = "bajabababa@###$$%$%^#&#&#&1285383969";

for(let i = str.length/2; i<str.length; i++){
    console.log(str[i]);
}
let count = 0;
let mount = 0;
for(let i = 0; i<str.length; i++){
    console.log("index of ab is : "+str.indexOf("ab",i));
if(str[i] == "ab"){
    console.log("a at the index of : " + i);
    count++;
}else if(str[i] == "b"){
    console.log("b at the index of : " + i);
    mount++;
}
}
console.log(count,mount);

for(let i = 0; i<str.length; i++){
    if(str[i] >= 'a' && str[i]<= 'z'){
        console.log(str[i] + " is a smallcase character");
    }else if(str[i] >= 'A' && str[i]<='Z'){
        console.log(str[i] + " is a uppercase character");
    }else if(str[i]>= '1' && str[i]<= '9'){
        console.log(str[i] + " is a number ");
    }else{
        console.log(str[i] + " is a  character");
    }
}

let str = "nono";
let count = 0;
for(let i = 0; i<str.length; i++){
    if(str.indexOf("no",i)){
        count++;
    }
}
console.log(count);

TASK 9

let str = "01234024";
let newStr = "";
for(let i = 0; i< str.length; i++){
    if(i%2 == 0){
        newStr = newStr + str[i];
    }
};
console.log(newStr);

TASK 10;

let str = "1267$52@abc";
let newStr = "";
for(let i = 0; i<str.length; i++){
    if(str[i]>= '1' && str[i]<= '9'){
        newStr = newStr + str[i];
    }
};
console.log(newStr);

TASK 11

let str = "qw23BN**45g";
let newStr = "";
for(let i = 0; i<str.length; i++){
    if(str[i]>= 'a' && str[i]<= 'z'){
        newStr = newStr + 'a';
    }else if(str[i]>= 'A' && str[i]<= 'Z'){
        newStr = newStr + 'A';
    }else if(str[i]>= '0' && str[i]<= '9'){
        newStr = newStr + '0';
    }else{
        newStr = newStr + str[i];
    }
};
console.log(newStr);

TASK 12

let str = "qw2B**5g";
let newStr = "";
for(let i = 0; i<str.length; i++){
    if(str[i]>= 'a' && str[i]<='z' || str[i]>='A' && str[i]<= 'Z'){
        newStr = newStr + str[i] + str[i];
    }else if(str[i]>= '0' && str[i]<= '9'){
        newStr = newStr + str[i] + str[i] + str[i];
    }
};
console.log(newStr);

TASK 13
let str = "9#a$M%2eP";
let numStr = "";
let lowerStr = "";
let upperStr = "";
for(let i = 0; i<str.length; i++){
    if(str[i]>= 'a' && str[i]<= 'z'){
        lowerStr = lowerStr + str[i];
    }else if(str[i]>= 'A' && str[i]<='Z'){
        upperStr = upperStr + str[i];
    }
    else if(str[i]>= '0' && str[i]<= '9'){
        numStr = numStr + str[i];
    }
};
console.log(lowerStr+numStr+upperStr);

TASK 14

let str = "9#a$M%2eP&$";
let newStr = "";
for(let i = 0; i<str.length; i++){
    if(str[i]>= 'a' && str[i]<='z' || str[i]>='A' && str[i]<='Z' || str[i]>= '0' && str[i]<= '9'){

    }else{
        newStr = newStr + str[i];
    }
};
console.log(newStr);

TASK 15

let str = "1234567890";
let newStr = "";
for(let i = 0; i<str.length/2; i++){
    newStr = newStr + str[i];
}
console.log(newStr);

TASK 16

let str = "1234567890";
let firstStr = "";
let secondStr = "";
for(let i = 0; i<str.length/2; i++){
    secondStr = secondStr + str[i];
}
// console.log(newStr);
for(let i = str.length/2; i<str.length; i++){
    firstStr = firstStr + str[i];
}
console.log(firstStr+secondStr);

TASK 17
let str = "12345";
let firstStr = "";
let secondStr = "";
for(let i = 0; i<str.length/2; i++){
    secondStr = secondStr + str[i];
}
// console.log(newStr);
for(let i = parseInt(str.length/2 ) +1; i<str.length; i++){
    firstStr = firstStr + str[i];
    // console.log(firstStr);
}
console.log(firstStr+secondStr);

TASK 18

let str = "dada";
let firstStr = "";
let secondStr = "";
for(let i = 0; i<str.length/2; i++){
    secondStr = secondStr + str[i];
}
// console.log(newStr);
for(let i = str.length/2; i<str.length; i++){
    firstStr = firstStr + str[i];
}
// console.log(firstStr+secondStr);

if(firstStr == secondStr){
    console.log("YES");
}else{
    console.log("NO");
}

TASK 19
let str = "helloo";
let ch = str[str.length/2];
console.log("Middle character is : "+ ch);
console.log("Index is : "+str.indexOf(ch));

TASK 22
let str = "ab11cd22ef";
let newStr = "";
for(let i = 0; i<str.length; i++){
    if(str[i] == '1'){
        newStr = newStr + '@';
    }else if(str[i] == '2'){
        newStr = newStr + '#';
    }else{
        newStr = newStr + str[i];
    }
}
console.log(newStr);

1 by @,
2 by #,
 3 by &
 and 4-9 by $.
  0 and other characters appear as it is in the new string and are not changed.Test CasesInputExpected Output12049brt@#0$$brta1b9c3d4QWa@b$c&d$QW

// TASK 23

let str = "a1b9c3d4QW";
let newStr = "";
for (let i = 0; i < str.length; i++) {
  if (str[i] == "1") {
    newStr = newStr + "@";
  } else if (str[i] == "2") {
    newStr = newStr + "#";
  } else if (str[i] == "3") {
    newStr = newStr + '&';
} else if (str[i] >= "4" && str[i] <= "9") {
    newStr = newStr + "$";
  } else {
    newStr = newStr + str[i];
  }
}
console.log(newStr);





// // console.log("New day !");
// let str = "12345";
// let len = str.length;
// let newStr = "";
// let middleStr = "";
// let firstStr = "";
// if(len %2 != 0){
//   middleStr = middleStr + str[parseInt(len/2)]
// };

// for(let i = parseInt(len/2) + 1; i<len; i++){
//   newStr = newStr + str[i];
// }
// for(let i = 0; i< parseInt(len/2); i++){
//   firstStr = firstStr + str[i];
// }
// console.log(middleStr);
// console.log(newStr);
// console.log(firstStr);

// if(middleStr != ""){
//   console.log(newStr + middleStr + firstStr);
// }else{
//   console.log(newStr + firstStr);
// }

// let str = "##ab##13###c##";
// let out = "";
// for(let i = 0; i<str.length; i++){
//   let ch = str[i];
//   let lastCh = str[i-1];
//   if(ch == "#"){
//     if(lastCh == "#"){
//       // nothing to do
//     }else{
//       out = out + ch;
//     }
//   }else{
//     out = out + ch;
//   }
// };
// console.log(out);


// let str = "yesnoyesnoyesno";
// let str2 = "yes";
// let count = 0;
// for(let i = 0; i<str.length; i++){
//   console.log(str.indexOf(str2 ,i));
// };
// console.log(count);

// TASK 24

// let str = "I GOT A BIRTHDAY CARD";
// let out = "";
// for(let i = 0; i<str.length; i++){
//   let ch = str[i];
//   if(ch == 'A'){
//     out = out + 'X';
//   }else if(ch == 'B'){
//     out = out + 'Y';
//   }else if(ch == 'C' || ch == 'D'){
//     // do noting 
//   }else{
//     out = out + ch;
//   };
// };
// console.log(out);


// TASK 25

// let str = "x+3+45+++";
// let out = "";
// for(let i = 0; i<str.length; i++){
//   let ch = str[i];
//   let lastCh = str[i-1];
//   if(ch == '+'){
//     if(lastCh == '+'){
//       //nothing to do
//     }else{
//       out = out + ch;
//     }
//   }else{
//     out = out + ch;
//   }
// };
// console.log(out);

//TASK 26

// let str = "AAXXXBBYYYCXXDYY";
// let out = "";
// for(let i = 0; i<str.length; i++){
//   let ch = str[i];
//   let lastCh = str[i-1];
//   if(ch == 'X'){
//     if(lastCh == 'X'){
//       //no
//     }else{
//       out = out + ch;
//     }
//   }else if(ch == 'Y'){
//     if(lastCh == 'Y'){
//       //no
//     }else{
//       out = out + ch;
//     }
//   }else{
//     out = out + ch;
//   }
// };
// console.log(out);

// TASK 27

// let str = "AB CD J ava";
// if(str.substring(0,4) == 'ABCD'){
//   console.log("Start with ABCD")
// }else{
//   console.log("does not start");
// }


// if(str[0] == 'A' && str[1] == 'B' && str[2] == 'C' && str[3] == 'D'){
//   console.log("Start with ABCD")
// }else{
//   console.log("Does not start")
// }

// task 28

// let str = "Perfect";
// let str2 = str.substring(1);
// console.log(str2);
// let count = 0;
// for(let i = 0; i<str.length; i++){
//   if(str.substring(0,i) == 'ABCD'){
//     count++;
//   }
// };
// console.log(count);



// TASK 28

// const str = "AB ABC ABCD ABCD ABC AB";
// let count = 0;
// for(let i = 0; i < str.length; i++){
//     if(str[i] === "A" && str[i+1] === "B" && str[i+2] === "C" && str[i+3] === "D"){
//         count++;
//     }
// }

// console.log(count);


// TASK 29

let str = "AB ABC ABCD ABCD ABC AB";
let result = "";
let i = 0;

while(i < str.length){
    if(str[i] === "A" && str[i+1] === "B" && str[i+2] === "C" && str[i+3] === "D"){
        result += "XYZ";
        i += 4;
    } else {
        result += str[i];
        i++;
    }
}

console.log(result);


// %%%%%%%%%%%%%%%%%%% FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
// tASK 2
// function check(n){
//     let sum = 0;
//     for(let i = 1; i<=n; i++){
//         sum = sum + i;
//     };
//     console.log(sum)
// };
// check(20);

// TASK 3
// function check(str1,ch){
//     let str2 = "";
//     for(let i = 0; i<str1.length; i++){
//         if(str1[i] == ch){
//             // nothing to do here 
//         }else{
//             str2 = str2 + str1[i];
//         }
//     };
//     console.log(str2);
// };
// check("moomozm","m");

// TASK 6

// function rev(str){
//     let newstr = "";
//     for(let i = str.length-1; i>=0; i--){
//         newstr = newstr + str[i];
//     };
//     console.log(newstr);
// };
// rev("123456789");

// TASK 7
// function ch(str,ch1,ch2){
//     let ch1Count = 0;
//     let ch2Count = 0;
//     for(let i = 0; i<str.length; i++){
//         if(str[i] == 'ch1'){
//             ch1Count++;
//         }else if(str[i] == ch2){
//             ch2Count++;
//         }
//     };

//     if(ch1Count > ch2Count){
//         console.log("1");
//     }else if(ch1Count == ch2Count){
//         console.log("0");
//     }else{
//         console.log("-1");
//     }
// };

// ch("moozoom","m","o");

// TASK 8

// function ch(str){
//     let count1 = 0;
//     let count2 = 0;
//     for(let i = 0; i<str.length; i++){
//         if(str[i] == '('){
//             count1++;
//         }else if(str[i] == ")"){
//             count2++;
//         };
//     };
//     if(count1 == count2){
//         console.log("True");
//     }else{
//         console.log("False");
//     }
// };
// ch("(a+b+(c+d*e)-(d+e*f))+3");

// TASK 10
// function p(n){
//     let count = 0;
//     for(let i = 2; i<n; i++){
//         if(n%i == 0){
//             count++;
//             break;
//         }
//     };
//     if(count == 0){
//         console.log("Prime");
//     }else{
//         console.log("not a prime");
//     }
    
// };
// p(5);

// TASK 11
// function p(n){
//     let count = 0;
//     for(let i = 2; i<n; i++){
//         if(n%i == 0){
//             return false
//         };
//     };
//     return true;
// };
// let count = 0;
// let n = 150;
// for(let i = 2; i<n; i++){
//     if(p(i)){
//         count++;
//     }
// }
// console.log(count);





// TASK 4

// function r(n1,n2,n3){
//     let count = 0;
//     if(n1*n1 == n2*n2 + n3*n3){
//         count++;
//     }else if(n2*n2 == n1*n1 + n3*n3){
//         count++;
//     }else if(n3*n3 == n1*n1 + n2*n2){
//         count++;
//     };

//     if(count>0){
//         console.log("True");
//     }else{
//         console.log("False");
//     }
// };

// r(6,8,10);

// TASK 5

// function checkValidity(a, b, c) 
// { 
    
//     if (a + b <= c || a + c <= b || b + c <= a) 
//         return false; 
//     else
//         return true; 
// }
// console.log(checkValidity(7,2,5));


//  TASK 12
// function ch(str,c){
//     let count = 0;
//     for(let i = 0; i<str.length; i++){
//         if(str[i] == c){
//             count++;
//         }
//     };
//     console.log(count);
// };

// ch("abracadabra","a");



// TASK 13
function maxCharCount(str) {
    let charCount = {};
    countChars(str, charCount);
    return maxCount(charCount);
  }
  
  function countChars(str, charCount) {
    for (let i = 0; i < str.length; i++) {
      const char = str[i];
      charCount[char] = (charCount[char] || 0) + 1;
    }
  }
  
  function maxCount(charCount) {
    let maxCount = 0;
    for (const char in charCount) {
      if (charCount[char] > maxCount) {
        maxCount = charCount[char];
      }
    }
    return maxCount;
  }
  console.log(maxCharCount("abracadabra"));  
// TASK 14
function s(n){
    let sum = 0;
    for(let i = 1; i<=10; i++){
        let lastDigit = n%10;
        sum = sum + lastDigit;
        n = (n - lastDigit)/10;
        // n = n/10;
    };
    console.log(sum);
};
s(24681);


// $$$$$$$$$$$$$$$$$$$$$$$$ ARRAYS $$$$$$$$$$$$$$$$$$$$$$$$$$$$$
// TASK 1
// let arr = [1,2,3,4,9,8,6,4];
// let count = 0;
// for(let i = 0; i<arr.length; i++){
//     if(arr[i] % 2 == 0){
//         count++;
//     }
    
// };
// console.log(count);

// TASK 2
// let arr = [1,20,30,4,9,8,6,4];
// let count = 0;
// for(let i = 0; i<arr.length; i++){
//     if(arr[i] % 5 == 0){
//         count = count + arr[i];
//     }
// };
// console.log(count);


//TASK 3

// let arr = ["vivek","kumar","singh"];
// for(let i = 0; i<arr.length; i++){
//     arr[i] = arr[i].toUpperCase();
// }
// console.log(arr);











// check wether is there any prime in an array
// TASK 4
// function isPrime(n){
//     for(let i = 2; i<n; i++){
//         if(n%i == 0){
//             return false;
//         }
//     };
//     return true;
// };
// let arr= [10,20,10,4];
// let count = 0;
// for(let i = 0; i<arr.length; i++){
//     if(isPrime(arr[i])){
//         count++;
//         break;
//     }
// };
// if(count>0){
//     console.log("True");
// }else{
//     console.log("False");
// }

// function arrPrime(num){
//     for(let i = 0; i<=num; i++){
//         if(isPrime(i)){
//             return true;
//         }
//     };
//     return false;
// };
// let arr = [1,2,3,4,5];
// console.log(arrPrime(arr));

// TASK 5


// let stringg = ['ab','zz','v','bi','B'];
// function b(s){
//     for(let i = 0; i<s.length; i++){
//         if(s[i] == 'b' || s[i] == 'B'){
//             return true;
//         }
//     };
//     return false;
// };


//     let count = 0;
//     for(let i = 0; i<stringg.length; i++){
//         if(b(stringg[i])){
//             count++;
//         }
//     };
//     console.log(count);


// ch(stringg);

// let stringg = ['ab','zz','v','bi'];
// let str = [1,2,3,4,5];
// let s = [0,9,8];
// let  n = stringg.concat(str).concat(s);
// console.log(n);
// let ar = [];
// for(let i = 0; i<stringg.length; i++){
//     ar.unshift(stringg[i]);
// };
// console.log(ar);

// TASK 6

// let arr = [1,2,3,4,5,6,7,8,9];
// let newArr= [];
// for(let i = 0; i<arr.length; i++){
//     if(arr[i]%3 != 0){
//         newArr.push(arr[i]);
//     }
// };
// console.log(newArr);


// TASK 8
// let str = [1,2,3,4,'hi','hello','no'];
// for(let i = 0; i<str.length; i++){
//     if(str[i] == 'hello'){
//         str.splice(i,1);
//     }
// };
// console.log(str);


// TASK 9

// let str = [1,2,3,4,'hi','js','hello','no'];
// for(let i = 0; i<str.length; i++){
//     if(str[i] == 'js'){
//         str.splice(i+1,0,'Angular','React','Node');
//     }
// };
// console.log(str);


// TASK 2
// let arr = [1,2,3,4,5];
// let sum = 0;
// for(let i = 0; i<arr.length; i++){
//     sum = sum + arr[i];
// };
// console.log(sum);


// TASK 3
// let arr = [1,2,3,4,5,12];
// let sum = 0;
// let count = 0;
// for(let i = 0; i<arr.length; i++){
//     if(arr[i]%3 == 0){
//         count++;
//         sum = sum + arr[i];
//     }
// };
// console.log("count is : " + count + " and the sum is : "+ " " + sum);

// TASK 4

// let arr = [1,2,3,4,5,12];
// let sum = 0;
// let oddSum = 0;
// for(let i = 0; i<arr.length; i++){
//     if(arr[i]%2 == 0){
//         sum = sum + arr[i];
//     }else{
//         oddSum = oddSum + arr[i];
//     }
// };

// console.log("odd sum is : " + oddSum);
// console.log("even sum is : " + sum);


// TASK 5
// let arr = [100,200,10,20,50,64];
// let earr = [];
// let count = 0;
// for(let i = 0 ; i<arr.length; i++){
//     if(arr[i] > 21){
//         count++;
//         earr.push(arr[i]);
//     }
// };

// console.log("count is : "+ count);
// console.log("numbers  are : "+ earr);

// TASK 6
// let arr = [2,3,5,7];
// for(let i = 0; i<arr.length; i++){
//     arr[i] = arr[i] + 10;
// };
// console.log(arr);

//TASK 7

// let arr = ['jacxk','harry'];
// for(let i = 0; i<arr.length; i++){
//     arr[i] = 'hello ' + arr[i]; 
// };
// console.log(arr);

// TASK 8

// let arr = [5,18,23,30];
// for(let i = 0; i<arr.length; i++){
//     if(arr[i]%2 != 0){
//         arr[i] = arr[i] + 1;
//     }
// };
// console.log(arr);

// TASK 9

// let arr = [110,8,6,4,2,110];
// if(arr[0] > arr[arr.length - 1]){
//     console.log("First :" + arr[0]);
// }else if(arr[0]< arr[arr.length - 1]){
//     console.log("Last : " + arr[arr.length - 1])
// }else{
//     console.log("Equal : " + arr[0]);
// }


// TASK 10

// let arr1 = [50,100];
// let arr2 = [1,3,4,5,6];


// function findSum(arr){
//     let sum = 0;
//     for(let i = 0; i<arr.length; i++){
//         sum = sum + arr[i];
//     };
//     return sum;
// };

// let sum1 = findSum(arr1);
// let sum2 = findSum(arr2);
// if(sum1 > sum2){
//     console.log("Big1")
// }else if(sum1<sum2){
//     console.log("Big 2")
// }else{
//     console.log("Equal")
// }

// TASK 11

// let arr = [100,200,10,20,50,64];
// let lar = 0;
// for(let i = 0; i<arr.length; i++){
//     let fe = arr[i];
//     let ne = arr[i+1];
//     if(lar < ne){
//         lar = ne;
//         // console.log(`inside if : ${lar}`)
//     }
// };
// console.log(lar);       


// TASK 12

// let arr = [1,1,1,1,1];
// function ch(arr){
//     for(let i = 0; i<arr.length; i++){
//         if(arr[0] != arr[i]){
//             return false;
//         }
//     };
//     return true;
// };

// let ans = ch(arr);
// if(ans == 0){
//     console.log("not Equal");
// }else{
//     console.log("Equal");
// };

// TASK 13

// let arr = [1,2,3,4,5,6,7,8,9,10,11];
// let count = 0;
// for(let i = 0;i<arr.length; i++){
//     let c = arr[i];
//     if(c % 2 == 0 || c% 3 == 0 || c % 5 == 0 || c % 7 == 0 ){
//         count++;
//     }
// };
// console.log(count);



// TASK 16
// let str = "babbb";
// function findAb(str){
//     for(let i = 0; i<str.length; i++){
//         if(str[i] == 'a' && str[i + 1] == 'b'){
//             return true;
//         }
//     };
//     return false;
// };

// let ans = findAb(str);
// if(ans == 0){
//     console.log("AB not FOUND")
// }else{
//     console.log("AB FOUND")
// }

// TASK 14
// function printSequenceOrNot(arr) {
//     let isSequence = true;
//     let min = arr[0];
  
//     // Find the minimum value in the array
//     for (let i = 0; i < arr.length; i++) {
//       if (arr[i] < min) {
//         min = arr[i];
//       }
//     }
  
//     // Check if the numbers in the array are consecutive
//     for (let i = 0; i < arr.length; i++) {
//       if (arr[i] !== (min + i)) {
//         isSequence = false;
//         break;
//       }
//     }
  
//     // Print "SEQUENCE" or "NOT"
//     if (isSequence) {
//       console.log("SEQUENCE");
//     } else {
//       console.log("NOT");
//     }
//   }
//   let arr = [12,13,14,15,16,17];
//   printSequenceOrNot(arr)







// TASK 14
// let arr = [12,13,14,15,16,17];
// function ch(arr){
//     for(let i = 0; i<arr.length; i++){
//         if(arr[i + 1] == arr[i] + 1 ){
//             return true;
//         }
//     };
//     return false;
// };
// let count = 0;
// for(let i = 0; i<arr.length; i++){
//     if(ch(arr[i])){
//         count = count + 0;
//     }else{
//         count++;
//     }
// }

// // let ans = ch(arr);
// if(count == 0){
//     console.log("yyo")
// }else{
//     console.log("ne")
// }

// TASK 17

// let arr = [5,18,26,30,40,6,9];
// let newArr = [];
// for(let i = 0; i<arr.length; i++){
//     if(arr[i] %2 == 0){
//         newArr.push(arr[i]);
//     }
// };
// console.log(newArr);


// TASK 18

// let arr = [5,18,26,30,40,6,9];
// let newArr = [];
// for(let i = 0; i<arr.length; i++){
//     if(arr[i] %2 == 0){
//         newArr.unshift(arr[i]);
//     }
// };
// console.log(newArr);



// TASK 19
// let arr = [5,18,26,30,40,6,9];
// for(let i = 0; i<arr.length; i++){
//     console.log(arr.pop());
// }

// TASK 20

// let arr = [5,18,26,30,40,6,9];
// for(let i = 0; i<arr.length; i++){
//     console.log(arr.shift());
// }


// TASK 21

// let arr = ['Jack','Bob','Ed','Steve'];
// let ch = "Steve";
// for(let i = 0; i<arr.length; i++){
//     if(arr[i] == ch){
//         arr.splice(i,1);
//     }
// };
// console.log(arr);


// TASK 22
// let arr = [5,18,26,30,40,6];
// let lar = 0;
// for(let i = 0; i<arr.length; i++){
//     let fe = arr[i];
//     let ne = arr[i + 1];
//     if(ne > fe){
//         lar = ne;

//     }
// };
// // console.log(lar);
// let ans = arr.indexOf(lar);
// arr.splice(ans,1);
// console.log(arr);


// TASK 23

// let arr = [5,18,26,30,40];
// let num = 32;
// for(let i = 0; i<arr.length; i++){
//     if(num> arr[i] && num <arr[i + 1]){
//         arr.splice(i + 1,0,num);
//         break;
//     }
// };
// console.log(arr);

// TASK 24

// let arr = [100,10];
// let arr2 = [20,50,64,200];
// console.log(arr.concat(arr2));


// TASK 25
let arr = [2,3,4,5];
let arr2 = [10,20,30,90,100,78];
let len = (arr.length) + (arr2.length);


for(let i = 0; i<=len; i++){
  if(arr.length == 0){
    console.log(arr2);
    break;
  }
    if(i % 2 == 0){
        if(arr2.length  >0){
          arr.splice(i + 1,0,arr2.shift())

        }
    }
};
console.log(arr);

















// function repeatChar(char, count) {
//     let result = '';
//     for (let i = 0; i < count; i++) {
//       result += 'x';
//     }
//     return result;
//   }
  
//   function insertXAfterChars(str, count) {
//     let result = '';
//     for (let i = 0; i < str.length; i++) {
//       result += str[i] + repeatChar(str[i], count);
//     }
//     return result;
//   }
  
//   // Example usage
//   const str = 'abc';
//   const result = insertXAfterChars(str, 1);
//   console.log(result); // Output: Axbxxcxxx
  
// let str = "Human";
// let output = "";

// for (let i = 0; i < str.length; i++) {
//   output += str[i]; // Add the current character to the output string
//   for (let j = 0; j <= i; j++) {
//     output += "x"; // Add the appropriate number of x's
//   }
// }

// console.log(output); // Outputs "Axbxxcxxx"

// cy +	d =	m or	cy - d =	m

// let equation = "5y + 10 = 40"; // example equation
// let c = 0, d = 0, m = 0, y = 0;
// let isPositive = true, isYFound = false;

// // Loop through each character of the equation string
// for (let i = 0; i < equation.length; i++) {
//   let currentChar = equation[i];

//   if (currentChar >= '0' && currentChar <= '9') {
//     // If the current character is a number, add it to the appropriate variable
//     if (!isYFound) {
//       c = c * 10 + parseInt(currentChar);
//     } else if (isPositive) {
//       m = m * 10 + parseInt(currentChar);
//     } else {
//       d = d * 10 + parseInt(currentChar);
//     }
//   } else if (currentChar === '+') {
//     // If the current character is '+', set isPositive to true
//     isPositive = true;
//   } else if (currentChar === '-') {
//     // If the current character is '-', set isPositive to false
//     isPositive = false;
//   } else if (currentChar === 'y') {
//     // If the current character is 'y', set isYFound to true
//     isYFound = true;
//   }
// }

// if (equation.includes("+")) {
//   // equation is of the form "cy + d = m"
//   y = (m - d) / c;
// } else {
//   // equation is of the form "cy - d = m"
//   y = (m + d) / c;
// }

// console.log(parseInt(y)); // Outputs the value of y











//task 6
// let str = "hiiiihihvihh"; // example string
// let count = 0; // initialize count to zero

// for (let i = 0; i < str.length; i++) {
//   let char = str[i];
//   let isDuplicate = false;

//   // compare this character with all the characters that come after it
//   for (let j = i+1; j < str.length; j++) {
//     if (char === str[j]) {
//       // if the characters match, this is a duplicate
//       isDuplicate = true;
//       break; // no need to continue comparing
//     }
//   }

//   if (!isDuplicate) {
//     // if we didn't find any duplicates, increment the count
//     count++;
//   }
// }

// console.log(count); // Outputs the number of different characters


// Given	the	marks	of	4 subjects	Maths,	English, Computers and	Science	as	input.	
// On	the	console	print	the	marks	in	each	subject	along	with	its	grade. Grades	are	
// defined	as	>=80	is	A,	<80	and	>=60	is	B	and	<60 and	>=40	is	C	and	<40	is	D.
// Also	print	the	subject	in	which	the	highest	was	scored.

// Maths	:	82	:	A
// English	:	70	:	B
// Computers	:	66	:	B
// Science	:	84	:	A
// Highest marks	:	Science

// function ch(n){
//     if(n>=80){
//         return 'A';
//     }else if(n>= 60){
//         return 'B';
//     }else if(n >= 40){
//         return 'C';
//     }else{
//         return 'D';
//     }
// };

// let math = 8;
// let Science = 84;
// let english = 70;
// let computers = 606;


// console.log("Maths : " + math + " : " + ch(math))
// console.log("Science : " + Science + " : " + ch(Science))
// console.log("English : " + english + " : " + ch(english))
// console.log("Computers : " + computers + " : " + ch(computers))
// if(math> Science){
//     if(math>english){
//         if(math>computers){
//             console.log("Heighest marks : Maths")
//         }
//     }
// }
// if(Science> math){
//     if(Science>english){
//         if(Science>computers){
//             console.log("Heighest marks : Science")
//         }
//     }
// }
// if(english> math){
//     if(english>Science){
//         if(english>computers){
//             console.log("Heighest marks : english")
//         }
//     }
// }
// if(computers> math){
//     if(computers>Science){
//         if(computers>english){
//             console.log("Heighest marks : computers")
//         }
//     }
// }

// let str1	=	"456789456789456";
// let str2	=	"456780009899765";


// function sum(str){
//     let ans = 0;
//     for(let i = 0; i<str.length; i++){
//         ans = ans + str[i];
//     };
//     return ans;
// };

// let ans1 = sum(str1);
// let ans2 = sum(str2);

// if(ans1> ans2){
//     console.log(str1);
// }else if(ans1<ans2){
//     console.log(str2);
// }else{
//     console.log("Equal")
// }

// let str = "hi@hi.com";
// let count = 0;
// let count2 = 0;
// for(let i = 0; i<str.length; i++){
//     if(str[0] >= '0' && str[0] <= '9'){
//         console.log("NOT PROPER");
//         break;
// }else if(str[0] == '@'){
//     console.log("NOT PROPER");
//     break;
// }else{
//     if(str[i] == '@'){
//         count++;
//     };

//     if(str.includes('.com') == 1){
//         count2++;
//     }
// }
// };

// if(count > 0 && count2 > 0){
//     console.log("PROPER")
// }else{
//     console.log("NOT PROPER")
// }

// // task 6
// let str = "a+b+c+d+e"; // example string
// let count = 0; // initialize count to zero

// for (let i = 0; i < str.length; i++) {
//   let char = str[i];
//   let isDuplicate = false;

//   // compare this character with all the characters that come after it
//   for (let j = i+1; j < str.length; j++) {
//     if (char === str[j]) {
//       // if the characters match, this is a duplicate
//       isDuplicate = true;
//       break; // no need to continue comparing
//     }
//   }

//   if (!isDuplicate) {
//     // if we didn't find any duplicates, increment the count
//     count++;
//   }
// }

// console.log(count); // Outputs the number of different characters



// %%%%%%%%%%%%$$$$$$$$$$$$$$$ JSON &&&&&&&&&&&&&&&^%%%%%%%%%%%%%%%%%$$$$$$$$$$$$$$$

// // let me = {
// //     name : "Vivek Kumar",
// //     age : 25,
// //     completed : ['Array','If-Else'],
// //     pending : true
// // };

// // let me2 = {
// //     name : "Pranav",
// //     age : 25,
// //     completed : ['Array','If-Else'],
// //     pending : true
// // };
// // let me3 = {
// //     name : "sarthak",
// //     age : 25,
// //     completed : ['Array','If-Else'],
// //     pending : true
// // };
// // let me4 = {
// //     name : "Hii",
// //     age : 25,
// //     completed : ['Array','If-Else'],
// //     pending : true
// // };

// // // console.log(me);
// // // me.name = "Vivek Singh Rajput";
// // // console.log(me);
// // // me.completed.push("functions");
// // // console.log(me);

// // // for(let i = 0; i< me.completed.length; i++){
// // //     console.log(me.completed[i]);
// // // }
// // let prof = {
// //     name : 'Manoj Dhuan',
// //     age : 35
// // };

// // let meArr = [me,me2,me3,me4];
// // console.log(meArr);
// // for(let i = 0 ; i<meArr.length; i++){
// //     meArr[i].facualty = prof;
// //     console.log(meArr[i]);

// // };

// let emp1 = {
//     name : "Vivek",
//     dept : "Software Engineering",
//     designation : "SDE",
//     salary : 200,
//     raise : true
// };
// let emp2 = {
//     name : "S",
//     dept : "UPsc",
//     designation : "IAS",
//     salary : 200,
//     raise : false
// };
// let emp3 = {
//     name : "pARI",
//     dept : "Queen",
//     designation : "Queen",
//     salary : 200,
//     raise : true
// };
// let emp4 = {
//     name : "Lala",
//     dept : "Engineering",
//     designation : "Kabadi",
//     salary : 200,
//     raise : false
// };
// let emp5 = {
//     name : "Prikshit",
//     dept : "Police",
//     designation : "SI",
//     salary : 200,
//     raise : true
// };

// let empolyee = [emp1,emp2,emp3,emp4];
// console.log(empolyee);

// let company = {
//     compName : "Private Technologies",
//     website : "www.PrivateTechnologies.com",
//     empolyee : empolyee
// }
// company.empolyee.push(emp5);
// console.log(company);
// // let total = 0;
// // for(let i = 0; i< company.empolyee.length; i++){
// //     total = total + company.empolyee[i].salary;
// // };
// // console.log(total);

// // for(let i = 0; i<company.empolyee.length; i++){
// //     if(company.empolyee[i].raise == true){
// //         company.empolyee[i].salary = company.empolyee[i].salary * 10;
// //         company.empolyee[i].raise = false;
// //     }
// // };
// let names = ['vivek','s'];
// // let wfh = {
// //     wfh : true
// // }
// for(let i = 0; i<company.empolyee.length; i++){
//     let empArr = company.empolyee;
//     if(isPres(empArr.name, names)){
//         empArr[i].wfh = true;
//     }else{
//         empArr[i].wfh = false;
//     }
// };

// function isPres(val,arr){
//     for(let i = 0; i<arr.length; i++){
//         if(arr[i] == val){
//             return true;
//         }
//     };
//     return false;
// };
// console.log(company);

// TASK 2

// let data1 = {
//     name : "Mark",
//     email : "mark@email",
//     salary : 8000
// };
// console.log(data1);

// TASK 3.1

// let data2 = {
//     billid : 45661,
//     amount : 2500
// };

// console.log(data2);

// // TASK 3.2
// data2.amount = 2700;
// console.log(data2);

// TASK 4

// let data1 = {
//     billid : 401,
//     amount: 200
// };
// let data2 = {
//     billid : 401,
//     amount: 500
// };

// console.log(data1.amount + data2.amount);

// TASK 5

// let data = {
//     id : "EMP1223",
//     email : "emp1223@email.com",
//     company : "EMP Inc"
// };

// console.log(data);

// TASK 6
// let p1 = {
//     code : "PX101",
//     stock : 15,
//     price : 30
// };
// let p2 = {
//     code : "PX102",
//     stock : 24,
//     price : 20
// };
// let p3 = {
//     code : "PX103",
//     stock : 33,
//     price : 10
// };

// let p4 = {
//     code : "PX104",
//     stock : 10,
//     price : 40
// };
// // console.log(p1,p2,p3);
//  let prodArr = [p1,p2,p3];

// // TASK 6.2
// let shop = {
//     poducts : prodArr
// };
// // console.log(shop);

// // TASK 6.3

// function totalQuantity(shop){
//     let prod = shop.poducts;
//     let sum = 0;
//     for(let i = 0; i<prod.length; i++){
//         sum = sum + prod[i].stock;
//     };

//     return sum;
// };

// // TASK 6.4

// shop.poducts.push(p4);
// let totalStock = totalQuantity(shop);
// shop.totalStock = totalQuantity(shop);
// // console.log(totalStock);
// // console.log(shop);

// // let totalStock = totalQuantity(shop);
// // shop.totalStock = totalQuantity(shop);
// // console.log(totalStock);
// // console.log(shop);

// // TASK 6.5
// function checkfun(code, name){
//     for(let i = 0; i<name.length; i++){
//         if(code == name[i]){
//             return true;
//         }
//     };
//     return false;
// }

// let newprice = ['PX102','PX103'];
// let prod = shop.poducts;
// for(let i = 0; i< prod.length; i++){
//     if(checkfun(prod[i].code , newprice)){
//         prod[i].price = prod[i].price + 100;
//     }
// };

// console.log(shop);

// TASK 7.1

let st1 = {
    name: "Mark",
    math: 80,
    english: 75,
    science: 63,
  };
  let st2 = {
    name: "Bob",
    math: 90,
    english: 81,
    science: 88,
  };
  let st3 = {
    name: "Julia",
    math: 88,
    english: 87,
    science: 89,
  };
  let st4 = {
    name: "Anthony",
    math: 60,
    english: 64,
    science: 61,
  };
  
  let students = [st1, st2, st3, st4];
  // students[0].computer = 89;
  console.log(students);
  
  // TASK 7.2
  
  let a = [
    { name: "Anthony", Computers: 70 },
    { name: "Mark", Computers: 90 },
    { name: "Julia", Computers: 88 },
    { name: "Bob", Computers: 81 },
  ];
  // let count = 0;
  for (let i = 0; i < students.length; i++) {
    for (let j = 0; j < a.length; j++) {
      if (students[i].name == a[j].name) {
        students[i].Computers = a[j].Computers;
      }
    }
  }
  
  // TASK 7.3
  
  function totalMarks(s){
      let sum = 0;
      sum = sum + s.Computers + s.english + s.math + s.science;
      // console.log(sum);
      return sum;
  }
  
  // TASK 7.4
  
  function avgMarks(s){
      let avg = 0;
      avg = s.Computers + s.english + s.math + s.science /4;
      // console.log()
      return avg;
  }
      function maxMarks(s){
          let max = s.english;
          if(s.math > max){
              max = s.math;
          };
  
          if(s.science > max){
              max = s.science;
          };
  
          if(s.Computers > max){
              max = s.Computers;
          }
  
          return max;
      }
  // 
  for(let i = 0; i< students.length; i++){
      students[i].total = totalMarks(students[i]);
      students[i].Average = avgMarks(students[i]);
      students[i].Max = maxMarks(students[i]);
  }
  // console.log(students.total);
  for(let i = 0; i<students.length; i++){
      console.log("Total marks of "+ students[i].name +"  "+ students[i].total)
      console.log("Average marks of "+ students[i].name +"  "+ students[i].Average)
      console.log("Maximum marks of "+ students[i].name +"  "+ students[i].Max)
  }
  // TASK 7.3
  // function totalMarks(students) {
    
    
  // Bob has left the school. Find the JSON corresponding to Bob and use splice to remove it from the array.
  
  
  // for(let i = 0; i<students.length; i++){
  //     // students[i].totalmarks = totalMarks(students);
  //     let total = 0;
  //     for (let j = 0; j < j; i++) {
  //         total =
  //           total +
  //           students[i].english +
  //           students[i].math +
  //           students[i].science +
  //           students[i].Computers;
  //       }
  //       console.log(total);
        
  // }
  
  // function ch(cn,a){
  //     for(let i = 0; i<a.length; i++){
  //         if(cn == a[i].name){
  //             return true;
  //         }
  //     };
  //     return false;
  // };
  
  // TASK 7.5
  // for(let i = 0; i<students.length; i++){
  //     if(students[i].name == 'Bob'){
  //         students.splice(i,1);
  //     }
  // }
  
  // console.log(students);

  

  // ARRAY METHODS #######################################################################################
  // TASK 1
let num = [1,3,5,7,16,18,29,0,14,2,3,4];
let x = 3;

function gr(num,x){
   return num > x;
}
let firstg = num.find(function(elem){
  return  gr(elem,x);
})

let firstI = num.findIndex(function(elem){
    return gr(elem,x);
})

let ar = num.filter(function(elem){
    return gr(elem,x)
})
console.log(firstg);
console.log(firstI);
console.log(ar);


// let val = num.findIndex(function(numi){
//     return numi %2 == 0;
// });

// let val = num.find((elem)=>{
//     console.log("va" + elem)
//     return elem > 116;
// })
// console.log(val);
// console.log(num.find(num%2 == 0));


// TASK 2
// let names = ['vivek','shiv','aka','vijay'];
// let ch = 'v';

// function findEvery(arry,charr){
//     return arry[0] == ch;
// }

// let f = names.find(function(n){
//     return findEvery(n,ch);
// });

// let inde = names.findIndex(function(elem){
//     return findEvery(elem,ch);
// })

// let fil = names.filter(function(elem){
//     return findEvery(elem,ch)
// })
// console.log(fil);
// console.log(inde);

// console.log(f);


// $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ JSON $$$$$$$$$$$$$$$$$$$$$$$

// // // Mark scored 80, 75 and 63 in Maths, English and Science.

// // // Bob scored 90, 81 and 88 in Maths, English and Science.
// // // Julia scored 88, 87 and 89 in Maths, English and Scienc

// // let s1 = {
// //   name :"Mark",
// //   Maths : 80,
// //   English : 75,
// //   science : 63
// // };
// // let s2 = {
// //   name :"Bob",
// //   Maths : 90,
// //   English : 81,
// //   science : 88
// // };
// // let s3 = {
// //   name :"Mark",
// //   Maths : 88,
// //   English : 87,
// //   science : 89
// // };
// // let s4 = {
// //   name :"Anthony",
// //   Maths : 87,
// //   English : 67,
// //   science : 60
// // };

// // let students = [s1,s2,s3];
// // students.push(s4)
// // // console.log(students);

// // let computer =  [{name:'Mark', Computers:90},
// // {name:'Anthony', Computers:70},
// // {name:'Julia', Computers:88},
// // {name:'Bob', Computers:81}]


// // for(let i = 0; i< students.length; i++){
// //   for(let j = 0; j<computer.length; j++){
// //     if(students[i].name == computer[j].name){
// //       students[i].computer = computer[j].Computers;
// //     }
// //   }
// // }

// // function maxi(s){
// //   console.log(s);
// //   console.log(s.name);
// // }

// // function totalMarks(s){
// //   let total = 0;
// //   total = total + s.Maths + s.English + s.science + s.computer ;
// //   console.log(total);
// //   return total;
// // }
// // for(let i = 0; i<students.length; i++){
// //   students[i].totalMark = totalMarks(students[i]);
// //   students[i].MaximunMark = maxi([students[i]]);
// // }

// // console.log(students);
// // TASK 1

// // let arr = [1,2,3,4,5,6,7,8,9,10];
// // let x = 6;
// // function check3(num,x){
// //   return num > x;
// // };

// // let firsts = arr.find((n)=>{
// //   return check3(n,x);
// // });

// // let firstI = arr.findIndex((n)=>{
// //   return check3(n,x);
// // });

// // let firarr = arr.filter((n)=>{
// //   return check3(n,x);
// // })

// // console.log(firstI + "  " + firsts);
// // console.log(firarr);


// // TASK 2

// // let names = ['vivek','jaya','sarthak','amit','di','vi','hi'];
// // let ch = 'v';

// // function checkch(c){
// //   return c[0] == ch;

// // }

// // let f = names.find(function(elem){
// //   return checkch(elem);
// // });

// // let fi = names.findIndex((elem)=>{
// //   return checkch(elem);
// // })

// // let fa = names.filter((elem)=>{
// //   return checkch(elem);
// // })
// // console.log(f);
// // console.log(fi);
// // console.log(fa);


// // TASK 3

// // let emp = [
// //   {name : "vivek", city : "gaya" , dept : "tech"},
// //   {name : "sarthak", city : "sonipat" , dept : "no tech"},
// //   {name : "pranav", city : "sirsa" , dept : "kabadi"},
// //   {name : "divya", city : "gazipur" , dept : "govt"},
// //   {name : "singh", city : "gaya" , dept : "tech"}
// // ];

// // let cityy = "gaya";
// // let deptt = "tech";

// // function ch(ob,c,d){
// //   return ob.city == c && ob.dept == d;
// // }
// // let f = emp.find(function(elem){
// //   // console.log(elem.name)
// //   return ch(elem,cityy,deptt);
// // });

// // let ar = emp.filter((elem)=>{
// //   return ch(elem,cityy,deptt);
// // })

// // console.log(f);
// // console.log(ar);


// let names = ['vivek','jaya','sarthak','amit','di','vi','hi'];
// let name2 = ['divya'];

// let al = [...name2,...names];
// console.log(al);
// console.log(names.join(' $ '))



//  APNA TIME AA GAYA 

// console.log("Got placed in april with a pakage of 22 lpa");

// let p1 = {
//     code : "PX101",
//     stock : 10,
//     price : 300
// };
// let p2= {
//     code : "PX102",
//     stock : 0,
//     price : 200
// };
// let p3 = {
//     code : "PX103",
//     stock : 30,
//     price : 100
// };
// let p4 = {
//     code : "PX104",
//     stock : 4,
//     price : 50
// };

// let incre = [
//     {code : "PX101"},
//     {code : "PX104"}
// ]
// let shop = [p1,p2,p3];
// shop.push(p4);

// for(let i = 0; i<shop.length; i++){
//     for(let j = 0; j<incre.length; j++){
//         if(shop[i].code == incre[j].code){
//             shop[i].price = shop[i].price + 1000;
//         }
//     }
// };

// for(let i = 0; i<shop.length; i++){
//     // console.log("hi");
//     if(shop[i].stock == 20){
//         shop[i].price = shop[i].price + 2000;
//     }
// };

// function totalStock(ob){
//     let sum = 0;
//     sum = sum + ob.stock;
//     return sum;
// };
// let total = 0;
// for(let i = 0; i< shop.length; i++){
//     total  = total + totalStock(shop[i]);
//     shop[i].totalStock = total;
// };
// for(let i = 0; i< shop.length; i++){
//     // total  = total + totalStock(shop[i]);
//     shop[i].totalStock = total;
// };
// console.log(total);
// console.log(shop);
// let he = document.getElementById("h");
// he.innerText = total;

// function ch(ob){
//     if(ob.stock == 0){
//         return true;
//     };
//     return false;
// }
// for(let i = 0; i<shop.length; i++){
//     if(ch(shop[i])){
//         shop.splice(i,1);
//     }
// };

// console.log(shop);

let n = ["vivek","vinay","akash","vikas","pranav","sarthak"];
let ch = 'v';
function re(elem,c){
    return elem[0] == c;
}
function findName (nameArr,tofine){
    let f = nameArr.filter(function(elem){
        return elem[0] == tofine;
    });
    return f;
};

console.log(findName(n,ch));
// let fi = n.filter(function(elem){
//     return elem[0] == ch;
// });

// console.log(f);
// console.log(fi);



// %%%%%%%%%% VERY IMPOTANT CONCEPT sort() method in javascript %%%%%%%%%%%%
// let arr = [1,2,3,4,5,6,7,78,8,9];
// let x = 4;
// function all (elem,x){
//     return elem > x;
// };

// let firstVal = arr.find(function(elem){
//     // all(elem,x);
//     return all(elem,x);
// });

// let firstIndex = arr.findIndex(function(elem){
//     return all(elem,x);
// })
// let filterFirst = arr.filter(function(elem){
//     return all(elem,x);
// })

// // let f = arr.find()
// console.log(firstVal);
// console.log(firstIndex);
// console.log(filterFirst);

// let ar2 = ["vivek","singh","rajput"];
// let check = (arr,ch)=>{
//     let f = arr.find((elem)=>{
//         return elem[0] == ch;
//     })
//     return f;
// };

// let f = check(ar2,"s");
// console.log(f);

// let allii = [...ar2,...arr];
// console.log(allii);

// allii.find(elem=> console.log(elem))

// let j = arr.join(" & ");
// for(let i = 0; i<j.length; i++){
//     console.log(j[i]);
//     // console.log(j[i]);
// }

let arr = [2,3,5,75,31,234,57,8,9,4322,1,2,3];
let s = (a,b)=>{
    if(a>b){
        return 1;
    }else if(b>a){
        return -1;
    }else{
        return 0;
    }
};

console.log(arr.sort(s));

let ar =[
    {name : "vivek" , age : 24},
    {name : "akash" , age : 24},
    {name : "pranav" , age : 40},
    {name : "sarthak" , age : 34},
    {name : "lala" , age : 19},
    {name : "prikshit" , age : 90},
    {name : "shreyansh" , age : 10},
    {name : "binaod" , age : 10},
];

// console.log(ar.sort((a,b)=>{
//     if(a.name[0]< b.name[0]){
//         return -1;
//     }else if(a.name[0]>b.name[0]){
//         return 1;
//     }else{
//         return 0;
//     }
// }));
console.log(ar.sort((a,b)=>{
    if(a.name[0]<b.name[0]){
        return -1;
    }else if(a.name[0]>b.name[0]){
        return 1;
    }else{
        return 0;
    }
}))
console.log(ar.sort((a,b)=>{
    return b.age-   a.age ;
}))

let name = ["vivek","akasj","jia","vipul"];

console.log(name.sort((a,b)=>{
    if(a[0]<b[0]){
        return -1;
    }else if(a[0]>b[0]){
        return 1;
    }else{
        return 0;
    }
}))

let sales = [
    {name : "pepsi", price : 30, quantity : 10},
    {name : "coke", price : 50, quantity : 10},
    {name : "limca", price : 40, quantity : 100},
    {name : "maza", price : 30, quantity : 100},
    {name : "frooty", price : 35, quantity : 100},
    {name : "mountain dew", price : 90, quantity : 1000}
];

for(let i = 0; i<sales.length; i++){
    sales[i].val = sales[i].price * sales[i].quantity
};

console.log(sales.sort((a,b)=>{
    if(a.val<b.val){
        return -1;
    }else if(a.val>b.val){
        return 1;
    }else{
        return 0;
    }
}))

console.log(sales);

// for(let i = 0; i<sales.length; i++){
//     sales[i].value = sales[i].price * sales[i].quantity;
// }

// console.log(sales.sort((a,b)=>{
//     if(a.quantity * a.price < b.quantity * b.price){
//         return -1;
//     }else if(a.quantity * a.price > b.quantity * b.price){
//         return 1;
//     }else{
//         return 0;
//     }
// }));



//



  
  
// complete index findindex filter sort() methods and practice questions

// Given an array of numbers,
// find the number and its index for
// a) equal to 10
// b) greater than 30
// c) multiple of 3

let ar = [
    1,
    2,
    3,
    4,
    5,
    6,
    6,
    6,
    7,
    788,
    9,
    9,
    908,
    65,
    5,
    53,
    3,
    32,
    ,
    34,
    5,
    5,
  ];
  console.log(
    ar.find((elem) => {
      return elem > 10;
    })
  );
  
  console.log(
    ar.findIndex((elem) => {
      return elem > 10;
    })
  );
  
  console.log(
    ar.filter((elem) => {
      return elem > 10;
    })
  );
  
  // Given an array of numbers, filter the arraya
  // a) equal to 10
  // b) greater than 30
  // c) multiple of 3
  
  console.log(
    ar.filter((e) => {
      return e == 10;
    })
  );
  
  console.log(
    ar.filter((e) => {
      return e > 30;
    })
  );
  
  console.log(
    ar.filter((e) => {
      return e % 3 == 0;
    })
  );
  
  // Given an array of names, find the name and its index for
  //  a) length of name is greater than 5
  //  b) starts with P
  //  c) starts with the character provided as a parameter
  
  let ar2 = [
    "vivek",
    "divya",
    "pranav",
    "sikhar",
    "shreyansh",
    "akash",
    "pritam",
    "juhi",
    "kareena",
    "sahrukh",
  ];
  
  let ch = "s";
  console.log(
    ar2.find((e) => {
      return e.length > 4;
    })
  );
  
  console.log(
    ar2.find((e) => {
      return e[0] == ch;
    })
  );
  
  // iven an array of names, filter the array for
  //  a) length of name is greater than 5
  //  b) starts with s
  //  c) starts with the character provided as a paramete
  
  console.log(
    ar2.filter((e) => {
      return e.length > 5;
    })
  );
  
  console.log(
    ar2.filter((e) => {
      return e[0] == "s";
    })
  );
  
  console.log(
    ar2.filter((e) => {
      return e[0] == ch;
    })
  );
  
  // Given an array of employees where each employee is a JSON
  // with name and age, findthe employee and its index for
  // a) age less than 35
  // b) name of the employee starts with S
  // c) name of the employee starts with the character provided as parameter Create suitable test cases and test properlyTask
  
  // 4.2Filter the abovearray of employees for
  // a) age less than 35
  // b) name of the employee starts with S
  
  let employee = [
    { name: "vivek kumar", age: 24 },
    { name: "pranav gupta", age: 28 },
    { name: "sarthak sharma", age: 34 },
    { name: "shikhar joshi", age: 17 },
    { name: "nayanjyoti", age: 30 },
    { name: "ranveer brar", age: 39 },
    { name: "garima", age: 35 },
    { name: "vikas khanna", age: 40 },
  ];
  
  console.log(
    employee.sort((a, b) => {
      if (a.age < b.age) {
        return -1;
      } else if (a.age > b.age) {
        return 1;
      } else {
        return 0;
      }
    })
  );
  
  console.log(
    employee.find((e) => {
      return e.age < 35;
    })
  );
  
  console.log(
    employee.findIndex((e) => {
      return e.age < 35;
    })
  );
  
  console.log(
    employee.filter((e) => {
      return e.name[0] == "s";
    })
  );
  
  console.log(
    employee.filter((e) => {
      return e.age > 35;
    })
  );
  
  // Given an array of string, find the first string whichendsin t.
  // Also find its index.
  // Also filter the array.For e.g. if the array was ['Hello', 'React', 'Java', 'Python', 'Hibernate', 'JavaScript']
  //  the output should be React and index should be 1and the output of filter should be ['React','JavaScript']
  
  let ar3 = ["Hello", "React", "Java", "Python", "Hibernate", "JavaScript"];
  
  console.log(
    ar3.find((e) => {
      return e[e.length - 1] == "t";
    })
  );
  
  console.log(
    ar3.findIndex((e) => {
      return e[e.length - 1] == "t";
    })
  );
  
  console.log(
    ar3.filter((e) => {
      return e[e.length - 1] == "t";
    })
  );
  
  // Given a character ch, find the first string has thech in it.
  //  Also finds its index and filter the array.
  //  So, for the above array if ch = 'y', the output should be Python, 3 and ['Python']
  //  If ch='a'the output should be React, 1 and ['React', 'Java', 'Hibernate', 'JavaScript'].
  let ch2 = "v";
  console.log(
    ar3.find((e) => {
      for (let i = 0; i < e.length; i++) {
        if (e[i] == ch2) {
          return e;
        }
      }
    })
  );
  
  console.log(
    ar3.filter((e) => {
      for (let i = 0; i < e.length; i++) {
        if (e[i] == "e") {
          return e;
        }
      }
    })
  );
  
  // Given an array of JSON representing students,
  
  // Task 6.1
  // Find the first student who has scored less than 50 in Maths. Also find its index.
  // Task 6.2Find the first student whose total marks in more than 200. Also find its index.
  // Task 6.3Find the first student who scored more in maths than english. Also find its index.
  // Task 6.4 Given a number n, find the first student who scored more than n in all subjects. Also find its index.
  // Task 6.5Filter the array for studentswho scored less than 50 in Maths.
  // Task 6.6Filter the array for students with total marks more than 200. Also find its index.Task
  //  6.7Filter the array for studentswho scored more in maths than english.
  //  Task 6.8Given a number n, filter the array for students who scored more than n in all subjects.
  //  Task 6.9Given two numbers n1 and n2 as input, filter the array for those whose marks in maths is more than n1 and marks in science is more than n2
  
  let students = [
    { name: "Jack", maths: 55, english: 60, science: 62 },
    { name: "Anita", maths: 62, english: 65, science: 56 },
    { name: "Thomas", maths: 68, english: 72, science: 75 },
    { name: "Steve", maths: 51, english: 56, science: 68 },
    { name: "Julia", maths: 47, english: 77, science: 72 },
    { name: "Mary", maths: 72, english: 55, science: 81 },
  ];
  
  console.log(students);
  
  let totalMark = (ar) => {
    let total = 0;
    total = total + ar.maths + ar.english + ar.science;
    return total;
  };
  
  console.log(
    students.find((e) => {
      return e.maths < 50;
    })
  );
  
  console.log(
    students.findIndex((e) => {
      return e.maths < 50;
    })
  );
  
  console.log(
    students.find((e) => {
      return totalMark(e) > 200;
    })
  );
  
  console.log(
    students.findIndex((e) => {
      return totalMark(e) > 200;
    })
  );
  
  console.log(
    students.find((e) => {
      return e.maths > e.english;
    })
  );
  
  console.log(
    students.findIndex((e) => {
      return e.maths > e.english;
    })
  );
  
  let num = 60;
  let num2 = 50;
  console.log(
    students.find((e) => {
      return e.english > num && e.maths > num && e.science > num;
    })
  );
  
  console.log(
    students.filter((e) => {
      return e.maths < 50;
    })
  );
  
  // Task 6.6Filter the array for students with total marks more than 200. Also find its index.Task
  //  6.7Filter the array for studentswho scored more in maths than english.
  //  Task 6.8Given a number n, filter the array for students who scored more than n in all subjects.
  //  Task 6.9Given two numbers n1 and n2 as input,
  // filter the array for those whose marks in maths is more than n1 and marks in science is more than n2
  
  console.log(
    students.filter((e) => {
      return totalMark(e) > 200;
    })
  );
  
  console.log(
    students.filter((e) => {
      return e.maths > num && e.science > num2;
    })
  );
  
  // Task 7.1Filter the array for those whose country is India.
  // Also find and findIndex the first JSON whose country is India.
  // Task 7.2Filter the array for those whose country is Indiaand age is less than 35.
  // Also find and findIndex the first JSON whose country is Indiaand age is less than 35.Task
  // 7.3Filter the array for those whose names has less than 6 characters
  // .Also find and findIndex the first JSON whose names has less than 6 characters.
  // Task 7.4Filter the array for those whose country is either Indiaor USA.
  // Also find and findIndex the first JSON whose country is either India or USA.Task
  // 7.5Given a number minAge, filter the array for those whose age is greater than minAge.
  // Also find and findIndex the first JSON whose age is greater than minAge.Task
  // 7.6Given a string str as input,filter the array for those whose country is one specified in str.
  
  const data = [
    { name: "Jack", country: "USA", age: 35 },
    { name: "Amit", country: "India", age: 38 },
    { name: "Edward", country: "USA", age: 41 },
    { name: "Vishal", country: "India", age: 30 },
    { name: "Annie", country: "USA", age: 27 },
    { name: "Nick", country: "France", age: 32 },
    { name: "Francis", country: "France", age: 44 },
    { name: "Preeti", country: "India", age: 25 },
    { name: "Sophie", country: "France", age: 29 },
    { name: "Harpreet", country: "India", age: 48 },
    { name: "Bob", country: "USA", age: 21 },
  ];
  
  console.log(
    data.sort((a, b) => {
      if (a.age < b.age) {
        return -1;
      } else if (a.age > b.age) {
        return 1;
      } else {
        return 0;
      }
    })
  );
  
  console.log(
    data.filter((e) => {
      return e.country == "India";
    })
  );
  
  console.log(
    data.find((e) => {
      return e.country == "India";
    })
  );
  
  console.log(
    data.findIndex((e) => {
      return e.country == "India";
    })
  );
  
  console.log(
    data.filter((e) => {
      return e.country == "India" && e.age > 30;
    })
  );
  
  console.log(
    data.filter((e) => {
      return e.name.length > 6;
    })
  );
  
  let str = "USA";
  console.log(
    data.filter((e) => {
      return e.country == str;
    })
  );
  
  // Task 8.1Filter the array for those whose total marks is less than 250.
  // Task 8.2Filter the array for those who have atleast 1 mark more than 70
  // Task 8.3Filter the array for those who have scored 2 or more marks greater than 70.
  // Task 8.4Given a number avg, filter the array for those whose average marks is greater than avg
  
  const student2 = [
    { name: "Mary", marks: [72, 65, 55, 70] },
    { name: "Anita", marks: [66, 70, 75, 53] },
    { name: "Edward", marks: [44, 54, 64, 58] },
    { name: "Thomas", marks: [62, 55, 65, 81] },
    { name: "Robin", marks: [41, 44, 47, 49] },
    { name: "Sophia", marks: [71, 73, 67, 77] },
    { name: "Bruce", marks: [52, 57, 61, 64] },
  ];
  
  console.log(student2);
  let totalMark2 = (ar) => {
    let total = 0;
    for (let i = 0; i < ar.marks.length; i++) {
      total += ar.marks[i];
    }
    return total;
  };
  
  console.log(
    student2.filter((e) => {
      return totalMark2(e) < 250;
    })
  );
  
  console.log(
    student2.filter((e) => {
      for (let i = 0; i < e.marks.length; i++) {
        if (e.marks[i] > 70) {
          return e;
        }
      }
    })
  );
  
  const avgMarks = (obj) => {
    let avg = 0;
    let total = totalMark2(obj);
    avg = total / (obj.marks.length - 1);
    return avg;
  };
  
  console.log(
    student2.filter((e) => {
      return avgMarks(e) > 80;
    })
  );
  
  // 9Define a function that takes an array of JSON,
  // a string and a boolean as parameters.
  // If the the boolean is true, filter and return the array whose name match the given string.
  // If the boolean is false, filter and return the array who tech match the given string
  
  const data3 = [
    { name: "Jack", tech: "Android" },
    { name: "Mary", tech: "React" },
    { name: "Bob", tech: "Angular" },
    { name: "Steve", tech: "Spring" },
    { name: "James", tech: "Android" },
    { name: "Julia", tech: "Android" },
    { name: "Michel", tech: "React" },
    { name: "Bill", tech: "Angular" },
    { name: "Sonny", tech: "Spring" },
    { name: "Martins", tech: "React" },
    { name: "Bruce", tech: "Angular" },
    { name: "Sam", tech: "Spring" },
  ];
  
  const mixData = (arr, str, isTrue) => {
    let ans;
    if (isTrue == true) {
      ans = arr.filter((e) => {
        return e.tech == str;
      });
    } else {
      return false;
    }
    return ans;
  };
  
  let d = mixData(data3, "Spring", true);
  console.log(d);
  
  // Given an array of string, create a string as shown.
  //  Use join.Test CasesInputExpected Output["Hi","Hello","Bye"]Hi#Hello#Bye
  //  ["A","B","C","X","Y"]A#B#C#X#Y["AB","!2","EF"]AB#12#EF
  
  console.log(ar3.join(" $ "));
  
  let seprator = (ar, sep) => {
    return ar.join(sep);
  };
  
  console.log(seprator(ar3, " ^ "));
  
  // Task 12Given an array of numbers like [12,5,-6,10,-9,4,0,-23,34]
  // a) Sort the numbers in ascending order
  // b) sort the numbers in descending order
  // c) sort the numbers based on their absolute valuein ascending orderCreate suitable test cases and test properl
  const numarr = [12, 5, -6, 10, -9, 4, 0, -23, 34];
  console.log(
    numarr.sort((a, b) => {
      if (a < b) {
        return -1;
      } else if (a > b) {
        return 1;
      } else {
        return 0;
      }
    })
  );
  
  // Task14.1Sort the array in ascending order of name.
  // Task14.2Sort the array in descendingorder of name.
  // Task14.3Sort the array in ascending order of total marksin 3 subjects.
  // Task14.4Sort the array in descendingorder marks in maths
  
  const st = [
    { name: "Jack", maths: 55, english: 60, science: 62 },
    { name: "Anita", maths: 62, english: 65, science: 56 },
    { name: "Thomas", maths: 68, english: 58, science: 54 },
    { name: "Steve", maths: 51, english: 56, science: 68 },
    { name: "Julia", maths: 47, english: 77, science: 72 },
    { name: "Mary", maths: 72, english: 55, science: 60 },
  ];
  
  // let totalMark = (ar) => {
  //     let total = 0;
  //     total = total + ar.maths + ar.english + ar.science;
  //     return total;
  //   };
  for (let i = 0; i < st.length; i++) {
    st[i].total_marks = totalMark(st[i]);
  }
  console.log(st);
  
  console.log(
    st.sort((a, b) => {
      if (a.total_marks < b.total_marks) {
        return -1;
      } else if (a.total_marks > b.total_marks) {
        return 1;
      } else {
        return 0;
      }
    })
  );
  // Task 15.1 Sort the array in ascendingorder of name
  // Task15.2  Sort the array in descendingorder of age
  const country = [
    { name: "Jack", country: "USA", age: 35 },
    { name: "Amit", country: "India", age: 38 },
    { name: "Edward", country: "USA", age: 41 },
    { name: "Vishal", country: "India", age: 30 },
    { name: "Annie", country: "USA", age: 27 },
    { name: "Preeti", country: "India", age: 25 },
    { name: "Sophie", country: "France", age: 29 },
    { name: "Harpreet", country: "India", age: 48 },
    { name: "Bob", country: "USA", age: 21 },
  ];
  
  console.log(
    country.sort((a, b) => {
      if (a.name[0] < b.name[0]) {
        return -1;
      } else if (a.name[0] > b.name[0]) {
        return 1;
      } else {
        return 0;
      }
    })
  );
  
  console.log(
    country.sort((a, b) => {
      if (a.age < b.age) {
        return 1;
      } else if (a.age > b.age) {
        return -1;
      } else {
        return 0;
      }
    })
  );
  
  // Task15.5Define a function that takes a country as parameter and returns
  // an array of people in that country sorted by age in descending order.
  
  let peopleInCountry = (count) => {
    let ar = country.filter((elem) => {
      return elem.country == count;
    });
    // console.log(ar);
    ar.sort((a, b) => {
      if (a.age < b.age) {
        return 1;
      } else if (a.age > b.age) {
        return -1;
      } else {
        return 0;
      }
    });
    return ar;
  };
  
  console.log(peopleInCountry("USA"));
  
  // Task16.1Sort the array in descendingorder of sum ofmarksarray.
  // Task16.2Sort the array in ascendingorder of maximum value in marks array.
  // Task16.3Given a number cutoff, count the number of elements in the marks array greater than cutoff. Sort the JSON array in descending order of this count.
  // Task16.4Define a function that takesa minTotalas parameter and returns an array of JSON whose total marks is greater than minTotalsorted by total scorein descending order.
  // Task16.5Define a function that takesa minScoreas parameter and returns an array of JSON in which all the entries in marks array is greater than minScoresorted by namein ascending order
  
  let st4 = [
    { name: "Mary", marks: [72, 65, 55, 71] },
    { name: "Anita", marks: [66, 70, 75, 53] },
    { name: "Edward", marks: [44, 54, 64, 58] },
    { name: "Thomas", marks: [62, 55, 65, 81] },
    { name: "Robin", marks: [41, 44, 47, 49] },
    { name: "Sophia", marks: [71, 73, 67, 77] },
    { name: "Bruce", marks: [52, 57, 61, 64] },
  ];
  
  const sumOfMarks = (obj) => {
    let sum = 0;
    for (let i = 0; i < obj.marks.length; i++) {
      sum += obj.marks[i];
    }
    return sum;
  };
  for (let i = 0; i < st4.length; i++) {
    st4[i].total_Marks = sumOfMarks(st4[i]);
  }
  
  console.log(
    st4.sort((a, b) => {
      if (sumOfMarks(a) < sumOfMarks(b)) {
        return -1;
      } else if (sumOfMarks(a) > sumOfMarks(b)) {
        return 1;
      } else {
        return 0;
      }
    })
  );
  
  console.log(
    st4.filter((elem) => {
      return elem.total_Marks < 250;
    })
  );
  
  let person_data = [
    { name: "Mary", city: "London" },
    { name: "Anita", city: "Paris" },
    { name: "Edward", city: "New York" },
    { name: "Thomas", city: "Rome" },
    { name: "Robin", city: "Seattle" },
    { name: "Sophia", city: "Los Angeles" },
    { name: "Bruce", city: "Delhi" },
  ];
  
  let person_continent = [
    { city: "London", continent: "Europe" },
    { city: "Delhi", continent: "Asia" },
    { city: "Seattle", continent: "North America" },
    { city: "Paris", continent: "Europe" },
    { city: "New York", continent: " North America" },
    { city: "Rome", continent: "Europe" },
    { city: "Bengaluru", continent: "Asia" },
    { city: "Los Angeles", continent: "North America" },
  ];
  
  for(let i = 0; i< person_data.length; i++){
    for(let j = 0; j< person_continent.length; j++){
      if(person_data[i].city == person_continent[j].city){
        person_data[i].continent = person_continent[j].continent;
      }
    }
  };
  
  
  console.log(person_data.filter((elem)=>{
    return elem.continent == "Europe";
  }))
  
  console.log(person_data);