Merge da2e9aa92b into ca3d16dcce

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

@@ -1,4 +1,4 @@
-import PriorityQueue from '../PriorityQueue';
+import PriorityQueue from '../new-priorety-queue';
 
 describe('PriorityQueue', () => {
   it('should create default priority queue', () => {

src/data-structures/priority-queue/new-priorety-queue.js

@@ -0,0 +1,60 @@
+
+export default class PriorityQueue {
+    constructor() {
+      this.arr=[];
+    }
+    isEmpty(){
+        return this.arr.length===0;
+    }
+    peek(){
+      return  this.isEmpty() ? null : this.arr[this.arr.length - 1][0];
+    }
+    add(item , priority = 0){
+          if(this.isEmpty()){
+             return this.arr =[[item,priority]];
+          }
+          for( let i = 0; i < this.arr.length; i++ ){
+              if(this.arr[i][1] <= priority ){
+                  this.arr.splice(i,0,[item,priority]);
+                  return this.arr;
+              }
+          }
+          return this.arr.push([item,priority]);
+    }
+  
+    poll(){
+        if(this.isEmpty()){
+            return null;
+        }
+        return this.arr.pop()[0];
+    }
+
+    changePriority(item, priority = 0) {
+        if(this.isEmpty()) {
+          return null;
+        }
+        for (let i = 0; i < this.arr.length; i++) {
+          if (this.arr[i][0] === item) {
+            this.arr.splice(i, 1);
+            this.add(item, priority);
+            return this.arr;
+          }
+        }
+        return null;
+      }
+    
+      hasValue(item) {
+        if(this.isEmpty()) {
+          return false;
+        }
+        for (let i = 0; i < this.arr.length; i++) {
+          if (this.arr[i][0] === item) {
+            return true;
+          }
+        }
+        return false;
+      }
+  }
+  
+
+