A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses (). Function names can contain letters, digits, underscores, and dollar signs (same rules as variables).

Jul 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 input and return an output where there is some obvious relationship between the input and the output.

Jun 28, 2025 · After defining a function, the next step is to call them to make use of the function. We can call a function by using the function name separated by the value of parameters enclosed between the parenthesis.

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

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 function expressions with the help of examples.

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 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 everything into separate blocks that perform different tasks.

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

Learn what JavaScript functions are and how to use them. We will discuss the different types of functions, their syntax, and how to use them in your code.

Jul 10, 2025 · The Function object provides methods for functions. In JavaScript, every function is actually a Function object.