Method firstKey

GDevelop.js/TestUtils/GDJSMocks.js:650–658

* @returns {?string} The first key of the Hashtable, or undefined if empty.

()

   * @returns {?string} The first key of the Hashtable, or undefined if empty.
   */
  firstKey() {
    for (var k in this.items) {
      if (this.items.hasOwnProperty(k)) {
        return k;
      }
    }

    return null;
  }

  /**
   * @param {Array<string>} result