zip-1.js

'use strict';

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
    }],
    counter,
    videoIdAndBookmarkIdPairs = [];

  for (counter = 0; counter < Math.min(videos.length, bookmarks.length); counter++) {
    videoIdAndBookmarkIdPairs.push({
      videoId: videos[counter].id,
      bookmarkId: bookmarks[counter].id
    });
  }

  return videoIdAndBookmarkIdPairs;
}

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