Close Contacts Enumerator polly-fill

enumerator.js

if (!window.Enumerator) {
    window.Enumerator = function (c) {
      this._c = Array.from(c);
      this._index = 0;
    }
    
    window.Enumerator.prototype.atEnd = function () {
      return this._index >= this._c.length - 1;
    }
    
    window.Enumerator.prototype.moveFirst = function () {
      this._index = 0;
    }
    
    window.Enumerator.prototype.moveNext = function () {
      if (this._index >= (this._c.length - 1))
        this._index = (this._c.length - 1);
      else {
        this._index += 1;
      }
    }
    
    window.Enumerator.prototype.item = function () {
      return this._c[this._index];
    }
}