zip-3.js

'use strict';


Array.prototype.zip = function(left, right, combinerFunction) {
  let results, length;

  length = Math.min(left.length, right.length);
  results = [];
  for (let i = 0; i < length; i++) {
    results.push(combinerFunction(left[i], right[i]));
  }

  return results;
}

function zip() {
  var videos = [{
      "id": 70111470,
      "title": "Die Hard",
      "rating": 4.0
    }, {
      "id": 654356453,
      "title": "Bad Boys",
      "rating": 5.0
    }, {
      "id": 65432445,
      "title": "The Chamber",
      "rating": 4.0
    }, {
      "id": 675465,
      "title": "Fracture",
      "rating": 5.0
    }],
    bookmarks = [{
      id: 470,
      time: 23432
    }, {
      id: 453,
      time: 234324
    }, {
      id: 445,
      time: 987834
    }];

  return Array.prototype.zip(videos, bookmarks, function(l, r) {
    return {
      videoId: l.id,
      bookmarkId: r.id
    };
  });
}

console.log(zip());
/* 
  [
    {bookmarkId: 470, videoId: 70111470}, 
    {bookmarkId: 453, videoId: 654356453}, 
    {bookmarkId: 445, videoId: 65432445}
  ]
*/