src/lib/arrays-to-tree.js

// {"category": "FP", "notes": "Converting from arrays to a deeper tree"}

/*
  Create a JSON response of movie lists with each video's id, title,
  bookmark time, and smallest box art url.
*/

'use strict';

import { MyArray } from '../lib/my-array.js';

let lists = [
  {
    'id': 5434364,
    'name': 'New Releases'
  },
  {
    'id': 65456475,
    name: 'Thrillers'
  }
];

let videos = [
  {
    'listId': 5434364,
    'id': 65432445,
    'title': 'The Chamber'
  },
  {
    'listId': 5434364,
    'id': 675465,
    'title': 'Fracture'
  },
  {
    'listId': 65456475,
    'id': 70111470,
    'title': 'Die Hard'
  },
  {
    'listId': 65456475,
    'id': 654356453,
    'title': 'Bad Boys'
  }
];

let boxarts = [
  {
    videoId: 65432445,
    width: 130,
    height:200,
    url:'https://cdn-0.nflximg.com/images/2891/TheChamber130.jpg'
  },
  {
    videoId: 65432445,
    width: 200,
    height:200,
    url:'https://cdn-0.nflximg.com/images/2891/TheChamber200.jpg'
  },
  {
    videoId: 675465,
    width: 200,
    height:200,
    url:'https://cdn-0.nflximg.com/images/2891/Fracture200.jpg'
  },
  {
    videoId: 675465,
    width: 120,
    height:200,
    url:'https://cdn-0.nflximg.com/images/2891/Fracture120.jpg'
  },
  {
    videoId: 675465,
    width: 300,
    height:200,
    url:'https://cdn-0.nflximg.com/images/2891/Fracture300.jpg'
  },
  {
    videoId: 70111470,
    width: 150,
    height:200,
    url:'https://cdn-0.nflximg.com/images/2891/DieHard150.jpg'
  },
  {
    videoId: 70111470,
    width: 200,
    height:200,
    url:'https://cdn-0.nflximg.com/images/2891/DieHard200.jpg'
  },
  {
    videoId: 654356453,
    width: 200,
    height:200,
    url:'https://cdn-0.nflximg.com/images/2891/BadBoys200.jpg'
  },
  {
    videoId: 654356453,
    width: 140,
    height:200,
    url:'https://cdn-0.nflximg.com/images/2891/BadBoys140.jpg'
  }
];

let bookmarks = [
  {
    videoId: 65432445,
    time: 32432
  },
  {
    videoId: 675465,
    time: 3534543
  },
  {
    videoId: 70111470,
    time: 645243
  },
  {
    videoId: 654356453,
    time: 984934
  }
];

export const movieLists = lists
.map((list) => {
  return {
    name: list.name,

    videos: videos
    .filter((video) => {
      return video.listId === list.id;
    })
    .map((video) => {
      return new MyArray()
      .zip(
        (bookmark, boxart) => {
          return {
            id: video.id,
            title: video.title,
            time: bookmark.time,
            boxart: boxart.url
          };
        },

        bookmarks.filter((bookmark) => {
          return bookmark.videoId === video.id;
        }),

        [boxarts.filter((boxart) => {
          return boxart.videoId === video.id;
        })
        .reduce((acc, curr) => {
          return acc.width * acc.height < curr.width * curr.height ?
            acc : curr;
        })]
      );
    })
    .concatAll()
  };
});