Implement a Stack | JavaScript

[Full explanation will be added soon.]

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Here is the full implementation.

class Stack {
  constructor() {
    this.storage = {};
    this.size = 0;
  }

  push(val) {
    this.storage[this.size] = val;
    this.size++;
  }

  pop() {
    let top = this.storage[this.size - 1];
    delete this.storage[this.size - 1];
    this.size--;
    return top;
  }

  peek() {
    return this.storage[this.size - 1];
  }

  getSize() {
    return this.size;
  }
    
  empty() {
    return this.getSize() === 0;
  }
}