JSFiddle - React, Tailwind, and code Playground

by Jessie Lau

HTML

Assignment: Swapping two values
Write a program that takes an array of numbers and returns an array where the first and last numbers in the array have been switched.For example say x = [2, 3, 5, 7, 6]. By the end of the program x, should be [6, 3, 5, 7, 2]. Do this without creating an empty array.

JavaScript

function swappingValues(arr) {
    var last = arr[arr.length - 1];
    arr[arr.length - 1] = arr[0];
    arr[0] = last;
    return arr;
}

console.log(swappingValues([1,2,3,4]));