Implement queue using array

Author: gopinav

queue-array.js

@@ -0,0 +1,43 @@
+class Queue {
+  constructor() {
+    this.items = [];
+  }
+
+  enqueue(element) {
+    this.items.push(element);
+  }
+
+  dequeue() {
+    return this.items.shift();
+  }
+
+  peek() {
+    if (!this.isEmpty()) {
+      return this.items[0];
+    }
+    return null;
+  }
+
+  isEmpty() {
+    return this.items.length === 0;
+  }
+
+  size() {
+    return this.items.length;
+  }
+
+  print() {
+    console.log(this.items.toString());
+  }
+}
+
+const queue = new Queue();
+console.log(queue.isEmpty());
+queue.enqueue(10);
+queue.enqueue(20);
+queue.enqueue(30);
+console.log(queue.size());
+queue.print();
+console.log(queue.dequeue());
+console.log(queue.peek());
+queue.print();