Method add

src/hints/HintSequencePlayer.js:51–56

* @param {function()[]} callbacks * @return {void}@memberof HintSequencePlayer

(...callbacks)

   * @return {void}@memberof HintSequencePlayer
   */
  add(...callbacks) {
    const length = callbacks.length;
    for (let i = 0; i < length; i++) {
      this.hints.push(callbacks[i]);
    }
  }

  /**
   * @param  {function()[]} callbacks