Array

class MyArray {
  #size;
  #length = 0;
  #data = {};
  constructor(sizeOrData) {
    if (arguments.length > 0) {
      if (arguments.length === 1) {
        this.#size = sizeOrData;
      } else {
        this.push(sizeOrData);
      }
    }
  }

  #checkLength() {
    if (this.#size !== undefined && this.#size === this.#length) {
      throw Error("Array is full");
    }
  }

  get length() {
    return this.#length;
  }

  push(...items) {
    for (let item of items) {
      this.#checkLength();
      this.#data[this.#length] = item;
      this.#length++;
    }
  }

  pop() {
    delete this.#data[this.#length - 1];
    this.#length--;
  }

  toString() {
    let string = '[ ';
    for (let i = 0; i < this.#length; i++) {
        string += ` ${this.#data[i]}`
        if (i < this.#length - 1) {
            string += ', ';
        }
    }

    return string + ' ]'
  }
}

const arr = new MyArray(3);

arr.push(1);
arr.push(10);
arr.push(100);
arr.push(11, 12, 12)

// console.log(arr);
// console.log(arr.length);

// arr.pop();
// console.log('' + arr);
// console.log(arr.length);

// const a = new Array(1,2,3,4);
// console.log(a);