Strings are objects within the JavaScript language. ... Converts the entire string to upper case. Note: The concat, match, replace, and search functions were added in JavaScript 1.2.

You use the "toUpperCase" function to convert a string value to all uppercase letters. You use this function when you want to display. Chron Logo Hearst Newspapers Logo. Skip to main content.

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.