A JavaScript function is a block of code designed to perform a particular task. A JavaScript function is executed when "something" invokes it (calls it).

JavaScript functions are defined with the function keyword. You can use a function declaration or a function expression.

Oct 14, 2022 · Functions are the main “building blocks” of the program. They allow the code to be called many times without repetition. We’ve already seen examples of built-in functions, like …

This tutorial introduces you to JavaScript functions that structure your code into smaller reusable units.

Jul 15, 2024 · The Function object provides methods for functions. In JavaScript, every function is actually a Function object.

A function is an independent block of code that performs a specific task. A function expression is a way to store functions in variables. In this tutorial, you will learn about JavaScript functions and …

Learn what are functions in JavaScript. Explore the basics of functions in JavaScript, including anonymous and arrow functions, and learn how to organize your code using functions.

Jun 8, 2025 · A function in JavaScript is similar to a procedure—a set of statements that performs a task or calculates a value, but for a procedure to qualify as a function, it should take some …

Jun 30, 2022 · In this article, you learned what functions in JavaScript are all about and how you can write your own functions. With functions, you can organize your code by grouping …

May 14, 2025 · In this article we'll explore fundamental concepts behind functions such as basic syntax, how to invoke and define them, scope, and parameters.