Method push

Data-Structures/Heap/KeyPriorityQueue.js:45–49

* Adds an element to the queue * @param {*} key * @param {number} priority

(key, priority)

   * @param {number} priority
   */
  push(key, priority) {
    this._heap.push(key)
    this.priorities.set(key, priority)
    this._shiftUp(this._heap.length - 1)
  }

  /**
   * Removes the element with least priority