7 More Killer One-Liners in JavaScript

This is a continuation of the previous list of JavaScript one-liners. If you haven’t checked out the article, you are highly encouraged to accomplish so.

Let’s crack on with the new list!

1. Sleep Function

JavaScript has NO built-in sleep function to wait for a given duration before continuing the execution flow of the code.

Luckily, generating a function for this purpose is straightforward

const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms));

2. Go Back to the Previous Page

Need to send the user back to the page they came from? history object to the rescue!

const navigateBack = () => history.back();
// Or
const navigateBack = () => history.go(-1);

3. Compare Objects

Javascript behaves in mysterious ways when comparing objects. Comparing objects with the === operator checks only the reference of the objects, so the following code always returns false:

const obj1 = { a: 1, b: 2 };
const obj2 = { a…