script15.js

// map()

let  birthYear = [1989,1990,1991,1992]
// [35,34,33,32]
let newArr = birthYear.map(function(el,index,arr){
    return 2024 - el 
})
console.log(newArr)

let numbers  = [11,22,33,44,55]
let newArrB = numbers.map(function(el){
    return el + 10
})
console.log(newArrB)

// filter()

let transactions = [123,-100,44,55,66,76,-89,-88]
let newArrC = transactions.filter(function(el){
    return el > 0
})
console.log(newArrC)

let newArrD = transactions.filter(function(el){
    return el < 0
})
console.log(newArrD)

let marks = [189,77,190,200,123,156,178]
let newArrE = marks.filter(function(el){
    return el > 100
})
console.log(newArrE)
// reduce()

let arr = [11,22,33]
let newArrF = arr.reduce(function(acc,el,index,arr){
    return acc + el 
},0)
console.log(newArrF)

// forEach 
let cities = ["banglore","pune","chennai","lahore"]
cities.forEach(function(el,index,arr){
    console.log('welcome '+ el)
})

// find() 
//            0  1  2  3  4  5  6  7  8
let markB = [44,55,66,33,44,55,66,77,88]
let above50 = markB.filter(function(el,index,arr){
    return el > 50
})
console.log(above50)

let above50First = markB.find(function(el,index,arr){
    return el > 50
})

//findIndex()
let above50FirstIndex = markB.findIndex(function(el,index,arr){
    return el > 50
})
console.log(above50FirstIndex)

// every()

let numbersB = [33,44,55,66,33,22,33,44]
let q1 = numbersB.every(function(el,index,arr){
    return el > 50
})
console.log(q1)

// some

let q2 = numbersB.some(function(el){
    return el > 50
})
console.log(q2)