Method spawn

lib/workers.js:357–362

* Creates a new worker * * @returns {WorkerObject}

()

   * @returns {WorkerObject}
   */
  spawn() {
    const worker = new WorkerObject(this.numberOfWorkers)
    this.workers.push(worker)
    this.numberOfWorkers += 1
    return worker
  }

  /**
   * @param {Number} numberOfWorkers