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function saveSelection() {
    if (window.getSelection) {
        var sel = window.getSelection();
        if (sel.getRangeAt && sel.rangeCount) {
            return sel.getRangeAt(0);
        }
    } else if (document.selection && document.selection.createRange) {
        return document.selection.createRange();
    }
    return null;

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function parseVideo (url) {
    // - Supported YouTube URL formats:
    //   - http://www.youtube.com/watch?v=My2FRPA3Gf8
    //   - http://youtu.be/My2FRPA3Gf8
    //   - http://y2u.be/huKvjPQ-Xm4
    //   - https://youtube.googleapis.com/v/My2FRPA3Gf8
    //   - http://www.youtube.com/embed/Ab25nviakcw
    //   - http://www.youtube-nocookie.com/v/Ab25nviakcw?version=3&hl=en_US
    //   - http://www.youtube.com/watch?feature=player_embedded&v=Ab25nviakcw#
    // - Supported Vimeo URL formats:

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// https://javascript.info/map-set

const uniqueObjectsByProp = (array, prop) => {
  let map = new Map(array.map(item => [item[prop], item]));
  return Array.from(map.values());
};

let arr = [{ id: 1, name: 'Item 1' }, { id: 2, name: 'Item 2' }, { id: 1, name: 'Item 1' }];
let uniqueArr = uniqueObjectsByProp(arr, 'id');