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JavaScript Functions. Previous Next . 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. // Function to compute the product of p1 and p2. function myFunction (p1, p2) { return p1 * p2; } Try it Yourself » JavaScript Function Syntax.
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- A basic javascript function, here we create a function that divides the 1st element by the second element. Javascript. function myFunction(g1, g2) {
- This example shows a basic declaration of a function in javascript. JavaScript. function calcAddition(number1, number2) { return number1 + number2;
- This example explains the usage of the Function expression. Javascript. const square = function (number) { return number * number; }; const x = square(4);
- This example describes the usage of the Arrow function. Javascript. const a = ["Hydrogen", "Helium", "Lithium", "Beryllium"]; const a2 = a.map(function (s) {
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 about JavaScript functions and function expressions with the help of examples.
- Defining functions. Function declarations. A function definition (also called a function declaration, or function statement) consists of the function keyword, followed by
- Calling functions. Defining a function does not execute it. Defining it names the function and specifies what to do when the function is called. Calling the function actually performs the specified actions with the indicated parameters.
- Function scope. Variables defined inside a function cannot be accessed from anywhere outside the function, because the variable is defined only in the scope of the function.
- Scope and the function stack. Recursion. A function can refer to and call itself. There are three ways for a function to refer to itself: The function's name.
To avoid repeating the same code all over places, you can use a function to wrap that code and reuse it. JavaScript provides many built-in functions such as parseInt() and parseFloat(). In this tutorial, you will learn how to develop custom functions.
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. Function Declaration. To create a function we can use a function declaration. It looks like this:
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Functions in JavaScript. 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. Syntax: function <function-name>(arg1, arg2, arg3,...) { //write function code here . };
