Array implementation using Object

array.js

class MyArray {
  constructor(arr = []) {
    this.value = arr.reduce((acc, cv, i) => {
      acc[i] = cv
      return acc
    }, {})
  }
  get length() {
    return Object.keys(this.value).length
  }
  push(val) {
    this.value[this.length] = val
    return this.length
  }
  pop() {
    delete this.value[this.length - 1]
    return this.length
  }
  forEach(cb) {
    let keys = Object.keys(this.value)
    for (let i = 0; i < keys.length; i++) {
      let key = keys[i]
      const value = this.value[key]
      cb(value)
    }
  }
}

let array = new MyArray([1, 2, 3])
array.length // 3
array.push(5) // 4 (returns the length of the array)
array.pop() // 5
array.forEach((elm) => console.log(elm)) // logs 1, 2 and 4