README.md

Code Challenge 1 - Return a reversed array

This code challenge required for a function called reverseArray that takes in an array and returns an array in the reversed order without using any built in methods available in JavaScript.

Whiteboard Process

Approach & Efficiency

Since the size of the length is known, a for loop was picked.

BigO

Time: O(n)
Space: O(1)

Solution

git clone this repository into a desired location.
Inside the repository, run npm install.
Navigate to the JavaScript folder and run npm test array-reverse

array-reverse.test.js

OR

The code below can be copied and execute it - change any of the array if desired.

// Edit three variables for testing
let array = [89, 2354, 3546, 23, 10, -923, 823, -12];
let arrayEmpty = [];
let arrayDataType = [ 'test', {test: 'test'}, 3, [3,4]];

const reverseArray = (arr) => {

  const arrNew = [];

  for( let i = 0; i < arr.length; i++){
    arrNew[arr.length - 1 - i] = arr[i];
  }
  console.log(arrNew)
  return arrNew;
}

reverseArray(array);
reverseArray(arrayEmpty);
reverseArray(arrayDataType);