Merge 587648a11e into 2c67b48c21

Changed the default priority to value of the item in the add() method.

src/data-structures/priority-queue/PriorityQueue.js

@@ -22,7 +22,7 @@ export default class PriorityQueue extends MinHeap {
    * @param {number} [priority] - items priority.
    * @return {PriorityQueue}
    */
-  add(item, priority = 0) {
+  add(item, priority = item) {
     this.priorities.set(item, priority);
     super.add(item);
     return this;