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). Example

A function is an independent block of code that performs a specific task, while a function expression is a way to store functions in variables. Here's a quick example of function and function expression.

Apr 15, 2025 · A JavaScript function is a block of code designed to perform a specific task. Functions are only executed when they are called (or "invoked"). JavaScript provides different ways to define functions, each with its own syntax and use case.

Jul 11, 2024 · JavaScript Function Examples A function in JavaScript is a set of statements that perform a specific task. It takes inputs, and performs computation, and produces output.

Mar 22, 2025 · In JavaScript, a function can be defined based on a condition. For example, the following function definition defines myFunc only if num equals 0: theObject.make = "Toyota"; }; } In addition to defining functions as described here, you can also use the Function constructor to create functions from a string at runtime, much like eval().

Jan 20, 2023 · JavaScript functions are basically used to encapsulate logic, making that code more reusable and easier to understand. The syntax for creating a function in JavaScript is quite simple. Functions can take input in the form of parameters and can return a value or output.

Sep 7, 2021 · Functions are a set of of organised instructions that correspond to a certain task or specific functionality a user wants to implement in their program to achieve a single desired outcome. The code inside a function runs only when it is needed, meaning only when it is called.

Oct 14, 2022 · We’ve already seen examples of built-in functions, like alert(message), prompt(message, default) and confirm(question). But we can create functions of our own as well. To create a function we can use a function declaration. It looks like this: function showMessage() { alert( 'Hello everyone!' ); }

Jan 26, 2025 · In JavaScript, a programmer can create any function to perform any task, e.g., a function to calculate the area of a square. A user-defined function groups code to perform a specific task and that group of code is given a name (identifier).

Functions are the basic building block of JavaScript. Functions allow us to encapsulate a block of code and reuse it multiple times. Functions make JavaScript code more readable, organized, reusable, and maintainable. In JavaScript, a function can be defined using the function keyword, followed by the name of a function and parentheses.