Functional programming with arrays Although JavaScript’s arrays are very capable out of the box, the functional paradigm improves the clarity and maintainability of array code.

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.

Learn about JavaScript Object Notation and JSON objects and arrays, including how and why they're used. Also, find out how JSON compares to HTML and XML.