Ejercicio 6

src/films.js

@@ -52,10 +52,20 @@ function orderByYear(array) {
 
 
 // Exercise 6: Calculate the average of the movies in a category
-function moviesAverageByCategory() {
+function moviesAverageByCategory(array) {
+  let { totalScore, numMovies } = array.reduce((acc, movie) => {
+    if (movie.genre) { 
+      acc.totalScore += movie.score;
+      acc.numMovies++;
+    }
+    return acc;
+  }, { totalScore: 0, numMovies: 0 });
 
+  return numMovies ? parseFloat((totalScore / numMovies).toFixed(2)) : 0;
 }
 
+
+
 // Exercise 7: Modify the duration of movies to minutes
 function hoursToMinutes() {
 

tests/films.spec.js

@@ -292,9 +292,47 @@ describe('Function "orderByYear"', () => {
 
 // Exercise 6
 // YOUR CODE HERE. Test moviesAverageByCategory()
+
+
 describe('Function "moviesAverageByCategory"', () => {
-  it('ADD YOUR CODE IN films.spec.js file', () => {
-    expect(typeof hoursToMinutes).toBe('coffee');
+  it('should be declared', () => {
+    expect(typeof moviesAverageByCategory).toBe('function');
+  });
+
+  it('should return a number', () => {
+    expect(typeof moviesAverageByCategory(movies, 'Drama')).toBe('number');
+  });
+
+  it('should be different from NaN', () => {
+    expect(moviesAverageByCategory(movies, 'Drama')).not.toBeNaN();
+  });
+  it(' should return the average score of movies selecting only the category. With 2 decimals! ', () => {
+    expect(moviesAverageByCategory([
+      {
+        title: 'Paths of Glory',
+        year: 1957,
+        director: 'Stanley Kubrick',
+        duration: '1h 28min',
+        genre: ['Drama', 'War'],
+        score: 8.4
+      },
+      {
+        title: 'Django Unchained',
+        year: 2012,
+        director: 'Quentin Tarantino',
+        duration: '2h 45min',
+        genre: ['Drama', 'Western'],
+        score: 8.4
+      },
+      {
+        title: 'Pulp Fiction',
+        year: 1994,
+        director: 'Quentin Tarantino',
+        duration: '2h 34min',
+        genre: ['Crime', 'Drama'],
+        score: 8.9
+      }
+    ], 'Drama')).toBe(8.57);
   });
 });