LAB SOLUTION - javascript-all-time-movies

README.md

LAB Solution | Javascript All Time Movies

LAB Repo - ironhackbcn lab-javascript-all-time-movies

movies.js

// HELPER FUNCTIONS

function convertHoursToMinutes(hours) {
  return hours * 60;
}

function isAnEmptyArray(array) {
  return array.length === 0;
}

//
// LAB ITERATIONS:

//
// Turn duration of the movies from hours to minutes
function turnHoursToMinutes(moviesArr) {
  var updatedMovies = moviesArr.map(function(movie) {
    var movieCopy = Object.assign({}, movie); //  https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
    var timeInMinutes = 0;

    if (typeof movie.duration === 'number') {
      timeInMinutes = movie.duration;
    } else {
      var timeArray = movie.duration.split(' ');
      var timeInMinutes = 0;

      timeArray.forEach(function(timeString) {
        var hours;

        if (timeString.includes('h')) {
          hours = parseInt(timeString);
          var convertedMinutes = convertHoursToMinutes(hours);

          timeInMinutes += convertedMinutes;
        } else if (timeString.includes('m')) {
          minutes = parseInt(timeString);
          timeInMinutes += minutes;
        }
      });
    }

    movieCopy.duration = timeInMinutes;
    return movieCopy;
  });

  return updatedMovies;
}

// Get the average of all rates with 2 decimals
function ratesAverage(moviesArr) {
  var numberOfMovies = moviesArr.length;
  var totalRate = moviesArr.reduce(function(totalRate, movie) {
    var updatedTotalRate = totalRate + movie.rate;
    return updatedTotalRate;
  }, 0);

  var averageRate = totalRate / numberOfMovies;
  var roundedRateString = averageRate.toFixed(2); // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toFixed
  var roundedRateFloat = parseFloat(roundedRateString); //  https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseFloat
  return roundedRateFloat;
}

//
// Get the average of Drama Movies
function dramaMoviesRate(moviesArr) {
  var dramaMovies = moviesArr.filter(function(movie) {
    return movie.genre.includes('Drama');
  });

  if (dramaMovies.length === 0) {
    return undefined;
  } else {
    var dramaRatesAverage = ratesAverage(dramaMovies);
    return dramaRatesAverage;
  }
}

// Order by time duration, in growing order
function orderByDuration(moviesArr) {
  var normalizedMovies = turnHoursToMinutes(moviesArr);

  normalizedMovies.sort(function(a, b) {
    if (a.duration < b.duration) {
      return -1;
    } else if (a.duration > b.duration) {
      return 1;
    } else if (a.duration === b.duration) {
      if (a.title < b.title) {
        return -1;
      } else if (a.title > b.title) {
        return 1;
      }
      return 0;
    }
  });

  var moviesOrdered = [...normalizedMovies];

  return moviesOrdered;
}

// How many movies did STEVEN SPIELBERG
function howManyMovies(moviesArr) {
  if (isAnEmptyArray(moviesArr)) {
    return undefined;
  }

  var dramaMoviesCount = moviesArr.reduce(function(dramaMovies, movie) {
    if (
      movie.genre.includes('Drama') &&
      movie.director === 'Steven Spielberg'
    ) {
      var updatedDramaMovies = dramaMovies + 1;
      return updatedDramaMovies;
    }
    return dramaMovies;
  }, 0);

  return `Steven Spielberg directed ${dramaMoviesCount} drama movies!`;
}
// Order by title and print the first 20 titles
function orderAlphabetically(moviesArr) {
  moviesArr.sort(function(a, b) {
    if (a.title > b.title) {
      return 1;
    }
    if (a.title < b.title) {
      return -1;
    }
    return 0;
  });

  var allMovieTitles = moviesArr.map(function(movie) {
    return movie.title;
  });

  if (allMovieTitles.length > 20) {
    var frist20Titles = allMovieTitles.slice(0, 20);
    return frist20Titles;
  }
  return allMovieTitles;
}

// Best yearly rate average
function bestYearAvg(moviesArr) {
  if (isAnEmptyArray(moviesArr)) {
    return undefined;
  }

  var moviesDataset = {};

  // Create an object for each year, with the year as a property name.
  // Object includes total of movies and rating for that year, example:
  // 2019: { year: 2019, moviesCount: 1 , totalOfAllRatings: 7 }
  moviesArr.forEach(function(movie) {
    if (!moviesDataset[movie.year]) {
      var newEntry = {
        year: parseInt(movie.year),
        moviesCount: 1,
        totalOfAllRatings: movie.rate,
      };

      moviesDataset[movie.year] = newEntry;
    } else {
      moviesDataset[movie.year].moviesCount += 1;
      moviesDataset[movie.year].totalOfAllRatings += movie.rate;
    }
  });

  // Update the moviesDataset to create avgRate property on each object
  for (var year in moviesDataset) {
    var { moviesCount, totalOfAllRatings } = moviesDataset[year];
    var averageRate = totalOfAllRatings / moviesCount;

    moviesDataset[year].avgRate = averageRate;
  }

  var bestYear = new Date().getFullYear();
  var bestAvgRate = 0;

  // Iterate over the moviesDataset object to find the year with the best avgRate
  for (var year in moviesDataset) {
    var dataPoint = moviesDataset[year];

    if (dataPoint.avgRate > bestAvgRate) {
      bestYear = dataPoint.year;
      bestAvgRate = dataPoint.avgRate;
    } else if (dataPoint.avgRate === bestAvgRate) {
      if (dataPoint.year < bestYear) {
        bestYear = dataPoint.year;
        bestAvgRate = dataPoint.avgRate;
      }
    }
  }

  bestAvgRate = parseFloat(bestAvgRate.toFixed(1));

  return `The best year was ${bestYear} with an average rate of ${bestAvgRate}`;
}