The function statement declares a function. A declared function is "saved for later use", and will be executed later, when it is invoked (called). In JavaScript, functions are objects, and they have both properties and methods.

6 days ago · A JavaScript function is a set of statements that take inputs, perform specific computations, and produce outputs. Essentially, a function performs tasks or computations and then returns the result to the user.

JavaScript functions are defined with the function keyword. You can use a function declaration or a function expression. Earlier in this tutorial, you learned that functions are declared with the following syntax: Declared functions are not executed immediately.

Mar 13, 2025 · Functions can be conditionally declared — that is, a function statement can be nested within an if statement. However, in non-strict mode, the results are inconsistent across implementations. The scoping and hoisting effect won't change regardless of whether the if body is actually executed.

Apr 7, 2025 · The function keyword can be used to define a function inside an expression. You can also define functions using the function declaration or the arrow syntax . Try it

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.

JavaScript provides many built-in functions such as parseInt() and parseFloat(). In this tutorial, you will learn how to develop custom functions. To declare a function, you use the function keyword, followed by the function name, a list of parameters, and the function body as follows: // function body // ...

Mar 31, 2024 · A function is a modular, reusable block of statements used to perform a set of related tasks, such as calculating and returning a value based on arguments provided to the function. As with all non-primitive values, functions are objects.

Jan 22, 2025 · There is another syntax for creating a function that is called a Function Expression. It allows us to create a new function in the middle of any expression. For example: Here we can see a variable sayHi getting a value, the new function, created as function() { alert("Hello"); }.

Sep 19, 2023 · When you create a function with a name, it’s called a function declaration (aka function definition or function statement). This is the most standard, basic way of writing a function and what you will use very often as a beginner. Here is an illustration of a function declaration: The function declaration above consists of: