class Node {
constructor(value) {
this.value = value;
this.next = null;
}
}
class Queue {
constructor() {
this.arr = [];
}
peek() {
if (this.arr.length !== 0) {
return this.arr[0];
}
return null;
}
push(value) {
this.arr.push(value);
return this;
}
pop() {
if (this.arr.length === 0) {
return null;
}
return this.arr.shift();
}
isEmpty() {
return (this.length === 0);
}
// print the elements in the queue
printList() {
console.log(this.arr.join(" | "));
}
}
const myQueue = new Queue();
// console.log(myQueue.isEmpty());
myQueue.push(10);
myQueue.push(20);
myQueue.push(30);
myQueue.push(40);
myQueue.printList();
// console.log(myQueue.peek());
// myQueue.printList();
console.log(myQueue.pop());
myQueue.printList();
console.log(myQueue.pop());
myQueue.printList();
console.log(myQueue.pop());
myQueue.printList();
console.log(myQueue.pop());
myQueue.printList();
console.log(myQueue.pop());
myQueue.printList();
