Solved lab.

src/movies.js

@@ -1,25 +1,56 @@
 // Iteration 1: All directors? - Get the array of all directors.
 // _Bonus_: It seems some of the directors had directed multiple movies so they will pop up multiple times in the array of directors.
 // How could you "clean" a bit this array and make it unified (without duplicates)?
-function getAllDirectors(moviesArray) {}
+function getAllDirectors(moviesArray) {
+    return moviesArray.map(movie => movie.director);
+}
 
 // Iteration 2: Steven Spielberg. The best? - How many drama movies did STEVEN SPIELBERG direct?
-function howManyMovies(moviesArray) {}
+function howManyMovies(moviesArray) {
+    return moviesArray.filter(movie => movie.director === 'Steven Spielberg' && movie.genre.includes('Drama')).length;
+}
 
 // Iteration 3: All scores average - Get the average of all scores with 2 decimals
-function scoresAverage(moviesArray) {}
+function scoresAverage(moviesArray) {
+    if(moviesArray.length === 0){
+        return 0;
+    }
+
+    const totalScore = moviesArray.reduce((sum, movie) => {
+        return sum + movie.score;
+    });
+
+    return +(totalScore / moviesArray.length).toFixed(2);
+}
 
 // Iteration 4: Drama movies - Get the average of Drama Movies
-function dramaMoviesScore(moviesArray) {}
+function dramaMoviesScore(moviesArray) {
+    const dramaMovies = moviesArray.filter(movie => movie.genre.includes('Drama'));
+    return scoresAverage(dramaMovies);
+}
 
 // Iteration 5: Ordering by year - Order by year, ascending (in growing order)
-function orderByYear(moviesArray) {}
+function orderByYear(moviesArray) {
+    return moviesArray.sort((a, b) => a.year - b.year);
+}
 
 // Iteration 6: Alphabetic Order - Order by title and print the first 20 titles
-function orderAlphabetically(moviesArray) {}
+function orderAlphabetically(moviesArray) {
+    return moviesArray.sort((a, b) => a.title.localeCompare(b.title)).slice(0, 20);
+}
 
 // BONUS - Iteration 7: Time Format - Turn duration of the movies from hours to minutes
-function turnHoursToMinutes(moviesArray) {}
+function turnHoursToMinutes(moviesArray) {
+    return moviesArray.map(movie => { 
+        const [hours, minutes] = movie.duration.split('h').map(Number);
+        return { ...movie, duration: hours * 60 + minutes };
+        });
+}
 
 // BONUS - Iteration 8: Best yearly score average - Best yearly score average
-function bestYearAvg(moviesArray) {}
+function bestYearAvg(moviesArray) {
+    const years = moviesArray.map(movie => movie.year).reduce((acc, year) => {
+        if(!acc[year]) acc[year] = 0;
+        return acc;
+        }, {});
+}