JS Array Re-Implementation

Array.js

// Exercise to re-implement a Javascript Array from scratch
// We are using a quazi implementation of memory (JS Array) to mimic directly accessing your system memory and simulating a block of memory
// const memory = require('./memory'); <=== fake memory using JS Array

// Initialize Array object (using ES6 class syntax here)
class Array {
  constructor() {
    this.length = 0;
    this._capacity = 0;
    this.ptr = memory.allocate(this.length);
  }
  const RATIO_SIZE = 3;

  push(value) {
    // first check if we have enough space to add new value based on current capacity. If not, resize and re-allocate space at RATIO_SIZE for room to grow in future
    if (this.length >= this._capacity) {
      this._resize((this.length + 1) * Array.RATIO_SIZE);
    }
    memory.set(this.ptr + this.length, value);
    // update length property of Array (increment by one here)
    this.length++;
  }
  
  _resize(size) {
    // grab reference to current pointer
    let oldPtr = this.ptr;
    // update pointer based on the new memory allocation size
    this.ptr = memory.allocate(size)
  }
  
}