Built-in JavaScript objects and functions are ones you'll use all the time. Here's how to use Object, JSON, String, Math, Date, and console in your JavaScript programs.

Get tips for instantiating JavaScript's prototype-based objects two ways: via constructor functions or object initialization.

Image () object in JavaScript and pass it the URL of the image you want preloaded. Say we have an image called heavyimagefile.jpg, which we want to ...