Web Development

Folder: Javascript

How to Get a Random Item from an Array in Javascript

Tutorial
For an array such as ['red', 'green', 'blue'], learn the algorithm to get a random item in Javascript and other programming languages.
How to Import Typescript Modules with .js Extension in Jest

Tutorial
How to make import "./foo.js" mean the same thing as import "./foo" in Jest.
How to Mock Global Variables in Jest

Tutorial
How to mock global modules like "browser" and "chrome" in Jest that don't use the "import" keyword.
Why Hashtags Can't Have Spaces

Explanation
Because the program that figures out where the hashtag starts and ends uses the hash sign (#) to figure out where the hashtag starts, and uses the space character ( ) to figure out where the hashtag ends.
How to Make Background Music Continue Playing after Clicking a Link using Javascript

Tutorial
Using currentTime, sessionStorage, and beforeunload to keep an <audio> playing after page load.