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  1. 123

    A JavaScript function is a block of code designed to perform a particular task. It is executed when "something" invokes it (calls it).

    Example

    // Function to compute the product of p1 and p2
    function myFunction(p1, p2) {
    return p1 * p2;
    }

    // Calling the function
    let result = myFunction(4, 3);
    console.log(result); // Output: 12
    Gekopieerd.

    Function Declaration

    A function is defined with the function keyword, followed by a name, parentheses (), and curly brackets {} containing the code to be executed.

    function name(parameter1, parameter2) {
    // code to be executed
    }
    Gekopieerd.

    Function Expression

    Functions can also be created using expressions. These functions can be anonymous or named.

    const square = function (number) {
    return number * number;
    };

    console.log(square(4)); // Output: 16
    Gekopieerd.

    Arrow Functions

    Arrow functions provide a shorter syntax for writing functions and do not have their own this value.

    const add = (a, b) => a + b;
    console.log(add(5, 3)); // Output: 8
    Gekopieerd.

    Function Invocation

    Functions can be invoked in various ways:

    Feedback
  2. W3School
    https://www.w3schools.com ā€ŗ js ā€ŗ js_functions.aspDit resultaat vertalen

    JavaScript Function Study Path - W3Schools

    A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses (). Function names can contain letters, digits, underscores, aā€¦
    Function Invocation

    The code inside the function will execute when "something" invokes(calls) the function: 1. When an event occurs (when a user clicks a button) 2. When it is invoked (called) from JavaScript code 3. Automatically (self invoked) You will learā€¦

    Function Return

    When JavaScript reaches a returnstatement, the function will stop executing. If the function was invoked from a statement, JavaScript will "return" to execute the code after the invoking statement. Functions often compute a retā€¦

    The () Operator

    The () operator invokes (calls) the function: Accessing a function with incorrect parameters can return an incorrect answer: Accessing a function without () returns the function and not the function result:

    Functions Used as Variable Values

    Functions can be used the same way as you use variables, in all types of formulas, assignments, and calculations.

  3. Mozilla Developer
    https://developer.mozilla.org ā€ŗ ... ā€ŗ Guide ā€ŗ FunctionsDit resultaat vertalen

    Functions - JavaScript | MDN

      • Defining functions. Function declarations. A function definition (also called a function declaration, ā€¦
      • Calling functions. Defining a function does not execute it. Defining it names the function and ā€¦
      • Function scope. Variables defined inside a function cannot be accessed from anywhere outside the ā€¦
      • Scope and the function stack. Recursion. A function can refer to and call itself. There are three ā€¦
      • Closures. Closures are one of the most powerful features of JavaScript. JavaScript allows for the ā€¦
      Bekijk de volledige lijst op developer.mozilla.org
  5. GeeksForGeeks
    https://www.geeksforgeeks.org ā€ŗ javascript ā€ŗ functā€¦Dit resultaat vertalen

    Functions in JavaScript - GeeksforGeeks

    22 jan. 2026 · Functions in JavaScript are reusable blocks of code designed to perform specific tasks. They allow you to organize, reuse, and modularize code. It ā€¦

  6. Programiz
    https://www.programiz.com ā€ŗ javascript ā€ŗ functionDit resultaat vertalen

    JavaScript Function and Function Expressions (with ā€¦

    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 ā€¦

  7. JavaScript Tutorial
    https://www.javascripttutorial.net ā€ŗ javascript-functionDit resultaat vertalen

    JavaScript Functions

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

  8. simplyjavascript.com
    https://simplyjavascript.com ā€ŗ function.htmlDit resultaat vertalen

    Simply JavaScript

    In JavaScript, a function can be called from within another function by simply invoking the function by its name, followed by parentheses to include any necessary arguments.

  9. JavaScript.com
    https://www.javascript.com ā€ŗ learn ā€ŗ functionsDit resultaat vertalen

    How to Write JavaScript Functions | JavaScript.com

    Want to learn all about JavaScript functions? Learn how to write a function, how to use it, and why you should use them in your JavaScript code today!

  10. The Modern JavaScript Tutorial
    https://javascript.info ā€ŗ function-basicsDit resultaat vertalen

    Functions - The Modern JavaScript Tutorial

    14 okt. 2022 · The function keyword goes first, then goes the name of the function, then a list of parameters between the parentheses (comma-separated, empty in ā€¦

  11. DEV Community
    https://dev.to ā€ŗ what-is-a-function-simple-explanation-with...Dit resultaat vertalen

    What is a Function? Simple Explanation with Examples

    2 dagen geleden · what is function ? 1.function is a block of code that perform specific task. *block... Tagged with beginners, codenewbie, javascript, tutorial.

  12. TutorialsTeacher.com
    https://www.tutorialsteacher.com ā€ŗ javascript ā€ŗ javascript-functionDit resultaat vertalen

    JavaScript Functions: From Basics to Advanced

    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.

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