Dynamic Array Javascript: https://repl.it/@NegarJF/Dynamic-array

DynamicArray.js

class DynamicArray{

  constructor(capacity){
    this.arr = [];
    this.capacity = capacity;
    this.length = 0;

    for(let i = 0; i < capacity; i++){
      this.arr[i] = null;
    }

  }

  get size() {
    return this.length;
  }

  get isEmpty(){
    return this.size === 0
  }

  get(index){
    return this.arr[index];
  }

  set(index, element){
    if(index < 0 || index > this.size){
      console.error('Out of Rane');
      return;
    }

    this.arr[index] = element;
    this.length++;
  }

  cheat(){
    return this.arr;
  }

  add(element){

    if(this.size >= this.capacity){

      this.capacity = this.capacity * 2;

      let newArray = [];
      for(let i = 0; i < this.capacity; i++){
        if(i < this.size) {
          newArray[i] = this.arr[i];
        }else{
          newArray[i] = null;
        }
      }

      this.arr = newArray;

    }

    this.arr[this.size] = element;
    this.length++;
  }


  removeAt(rm_index){
    if(rm_index < 0 || rm_index > this.size){
      console.error('Out of Rane');
      return;
    }

    let data = this.arr[rm_index];
    let newArray = [];

    for(let i = 0, j = 0; i < this.size; i++, j++){
      if(i === rm_index){
        j--;
      }else{
        newArray[j] = this.arr[i];
      }
    }

    this.arr = newArray;
    this.length--;
    this.capacity = this.size;

    return data;
  }

  clear(){
    for(let i= 0; i< this.size; i++){
      this.arr[i] = null;
    }

    this.length = 0;
  }

};

module.exports = DynamicArray;