Function declaration is one specific way to define a function.

A function declaration creates a Function object. Each time when a function is called, it returns the value specified by the last executed return statement, or undefined if the end of the function body is reached.

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Learn JavaScript functions: declarations, expressions, arrow functions, and IIFE. Understand parameters, return values, and scope with interactive examples.

March 19, 2023 - Six ways to declare (define) JavaScript functions: function declaration, function expression, arrow function, and more. Pick the one you need.

February 14, 2025 - In JavaScript, function declarations are a basic and fundamental way to create functions. You use the keyword function, followed by a name you give to your function.

June 30, 2024 - A function declaration is a standard way of defining a function using the function keyword, followed by the name of the function.

Learn how to declare a function in JavaScript using the function keyword, parameters, and curly braces. Includes examples and hoisting explanation.

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.

January 3, 2024 - A function declaration also known as a function statement declares a function with a function keyword.

November 22, 2020 - Each function declaration starts with the function keyword and must always have a name. Without a name, there would be no way to refer to the function that was defined.

July 23, 2022 - Unlike function declaration, you can’t call a function expression before creating it, it will throw an error. So we can only call a function expression only after we have created it. in JavaScript, a function is treated as a special kind of value, and any value can be assigned to a variable.

In JavaScript, a function is not a “magical language structure”, but a special kind of value. The syntax that we used before is called a Function Declaration:

July 6, 2022 - In JavaScript, there are two ways to create functions: function declaration and function expression. Function declarations are written with the keyword “function”, while function expressions are defined with a variable keyword and store ...

An argument is the value that is passed to the function when it is called (it’s a call time term). We declare functions listing their parameters, then call them passing arguments.

April 21, 2021 - If you notice, the first thing I did was write function , this tells JavaScript that what I’m doing is defining a new bit of code for it to store and execute later. This is called a function declaration. What I wrote afterwards , greeting , is the function name.

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This chapter discusses JavaScript's basic grammar, variable declarations, data types and literals.