Dequeue algorithm is not working. please help

[naimiii]

I have been trying to perform dequeue operation using for loop but it’s not working while the enqueue is working at my end.

//queue class
class Queue {
  //// Array is used to implement queue
  constructor() {
    this.items = [];
    // Functions to be implemented
    // enqueue(item)
    // dequeue()
    // isEmpty()
    // printQueue()
  }
  //this.size = 0;

  // enqueue function
  enqueueCustomMethod(element) 
 

  {
    this.items[this.size] = element;
    console.log(`${element} added `);
    this.size += 1;
    return this.size - 1;
    // adding element to the queue using custom method
    //this.items.push(element);
  }

dequeueCustomMethod() {
    
    for (let i = 0; i < this.items.length; i++) {
      this.items[i - 1] = this.items[i];
      //console.log(`${this.items} deleted `);
    }

    this.items[this.items.length - 1] = 0;
  }
let myQueue = new Queue();
// Adding elements to the queue
// queue contains [10, 20, 30, 40, 50]
myQueue.enqueueCustomMethod(10);
myQueue.enqueueCustomMethod(20);
myQueue.enqueueCustomMethod(30);
myQueue.enqueueCustomMethod(40);
myQueue.enqueueCustomMethod(50);
myQueue.enqueueCustomMethod(60);
myQueue.enqueueCustomMethod(70);

// removes 10 from the queue
// queue contains [20, 30, 40, 50, 60]
console.log(myQueue.dequeueCustomMethod());

[dlaub3]

@naimiii

this.items[i - 1] = this.items[i];

What are you trying to accomplish there? The first loop you have this.items[-1] = this.items[0];.

I think you’ll need to use a new array and add items to it if you want to continue using a for loop. Does the challenge discourage using push, pop and other array methods?

[naimiii]

the challenge is to create a logic of shift method ( dequeue in stack) without using shift itself. How would I do that?

[dlaub3]

Do you need to return the item you remove from the array?

[naimiii]

Nope. I don’t need to return the item i remove from the array right now.

[dlaub3]

Which challenge are you working on? Please add a link.

[naimiii]

I have got an assignment from my bootcamp intructor to perform queues operations (enqueue, dequeue) on an array. As I share my complete my code above.

[dlaub3]

How did you verify that the enqueueCustomMethod method is working? I think you should try using console.log in both methods to verify the contents of this.items after running.