https://developer.mozilla.org › fr › docs › Web › JavaScript › Guide › Functions

Une fonction est une procédure JavaScript, un ensemble d'instructions effectuant une tâche ou calculant une valeur. Afin d'utiliser une fonction, il est nécessaire de l'avoir auparavant définie au sein de la portée dans laquelle on souhaite l'appeler.

https://www.w3schools.com › js › js_functions.asp

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).

https://developer.mozilla.org › en-US › docs › Web › JavaScript › Guide › Functions

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.

https://developer.mozilla.org › fr › docs › Web › JavaScript › Reference › Statements › function

Description. Une fonction créée via une déclaration de fonction est un objet Function et possède toutes les caractéristiques (propriétés, méthodes et comportement) d'un objet Function. Voir la page Function pour plus d'informations sur ces caractéristiques.

https://javascript.info › function-basics

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 alert(message), prompt(message, default) and confirm(question). But we can create functions of our own as well.

https://devdoc.net › web › developer.mozilla.org › en-US › docs › JavaScript › Guide › Functions.html

Functions are one of the fundamental building blocks in JavaScript. A function is a JavaScript procedure—a set of statements that performs a task or calculates a value. To use a function, you must define it somewhere in the scope from which you wish to call it.

https://runebook.dev › fr › docs › javascript › functions

JavaScript. Functions. D'une manière générale, une fonction est un "subprogram" qui peut être appelé par du code externe (ou interne, en cas de récursion) à la fonction. Comme le programme lui-même, une fonction est composée d’une séquence d’instructions appelée corps de fonction.

https://www.w3schools.com › js › js_function_definition.asp

JavaScript functions are defined with the function keyword. You can use a function declaration or a function expression. Function Declarations. Earlier in this tutorial, you learned that functions are declared with the following syntax: function functionName (parameters) { // code to be executed. } Declared functions are not executed immediately.

https://web.dev › learn › javascript › functions

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.