JavaScript Function Examples Last Updated : 11 Jul, 2024 Comments Improve Suggest changes Like Article Like Report A function in JavaScript is a set of statements that perform a specific task. It takes inputs, and performs computation, and produces output. The idea is to put some commonly or repeatedly done tasks together and make a function so that instead of writing the same code again and again for different inputs, we can call that function.JavaScript Function ExamplesSyntax:function myFun(parameter) { statements...};Example: Here is the basic JavaScript function example in which we add 2 elements. JavaScript function myFunction(a, b) { return a + b; } // Calling the function const result = myFunction(5, 2); console.log(result); Output7 JavaScript Function ExamplesThe following JavaScript section contains a wide collection of JavaScript examples. Many of these programming examples contain multiple approaches to solve the problem.Sr. No.QuestionsHow to write a function in JavaScript?2What is currying function in JavaScript?3How to call JavaScript function in HTML?4What is the purpose of setTimeout() function in JavaScript?5What is a typical use case for anonymous functions in JavaScript?6How to check whether a number is NaN or finite in JavaScript?7How to encode and decode a URL in JavaScript?8How to declare the optional function parameters in JavaScript?9How to get the javascript function parameter names/values dynamically?10How to include a JavaScript file in another JavaScript file?11How to override a JavaScript function?12Using the function* Declaration in JavaScript13What is the difference between call and apply in JavaScript?14How to find out the caller function in JavaScript?15How to negate a predicate function in JavaScript?16How to iterate over a callback n times in JavaScript?17How to create a function that invokes function with partials appended to the arguments in JavaScript?18How to remove the key-value pairs corresponding to the given keys from an object using JavaScript?19How to create a function that invokes each provided function with the arguments it receives using JavaScript?20How to call function from it name stored in a string using JavaScript?21How to measure time taken by a function to execute using JavaScript?22How to check a function is defined in JavaScript?23How to create a function that invokes the provided function with its arguments transformed in JavaScript?24How to wait for a promise to finish before returning the variable of a function?25How to change the value of a global variable inside of a function using JavaScript?26How to get the index of the function in an array of functions which executed the fastest in JavaScript?27How to add an element horizontally in Html page using JavaScript?28How to add fade-out effect using pure JavaScript?29How to add fade-in effect using pure JavaScript?30How to understand various snippets of setTimeout() function in JavaScript?We have a complete list of Javascript Function, to check those please go through this JavaScript Function Complete Reference article.We have created an article of JavaScript Examples, and added list of questions based on Array, Object, Function, ..., etc. Please visit this JavaScript Examples to get complete questions based articles list of JavaScript.We have created a complete JavaScript Tutorial to help both beginners and experienced professionals. Please check this JavaScript Tutorial to get the complete content from basic syntax and data types to advanced topics such as object-oriented programming and DOM manipulation.Recent articles on JavaScript Comment More infoAdvertise with us Next Article Javascript Map Programming Examples V vishalkumar2204 Follow Improve Article Tags : JavaScript Web Technologies Similar Reads JavaScript Programming Examples JavaScript is a dynamic, widely-used programming language that plays a pivotal role in modern web development. Whether you're a beginner or an experienced developer, practicing JavaScript programming examples is an excellent way to refine your coding skills, enhance your problem-solving abilities, a 15 min read JavaScript Array Examples JavaScript array is used to store multiple elements in a single variable. JavaScriptlet a = ["HTML", "CSS", "JS"] console.log(a)Output[ 'HTML', 'CSS', 'JS' ] Using New KeywordJavaScript// Declaring an array using Array Constructor let a = new Array(3) a[0] = "HTML" a[1] = "CSS" a[2] = "JS" console.l 3 min read JavaScript Date Programming Examples The JavaScript comes with a built-in datatype called the Date object. The Date object is created by using a new keyword, i.e. new Date() . The Date object can be used for date and time in terms of millisecond precision within 100 million days before or after 1/1/1970. JavaScript Date Programming Exa 5 min read JavaScript Function Examples A function in JavaScript is a set of statements that perform a specific task. It takes inputs, and performs computation, and produces output. The idea is to put some commonly or repeatedly done tasks together and make a function so that instead of writing the same code again and again for different 3 min read Javascript Map Programming Examples A Javascript map is a collection of elements where each element is stored as a Key, value pair. Map objects can hold both objects and primitive values as either key or value. When we iterate over the map object it returns the key, and value pair in the same order as inserted.Javascript Map Programmi 3 min read JavaScript Math Programming Examples The JavaScript Math Object is used to perform mathematical operations on numbers. The Math object does not have a constructor. All properties and methods of Math are fixed/static. All properties and methods of Math are static and can be called by using Math as an object.JavaScript Math Programming E 2 min read JavaScript Number Programming Examples Javascript Numbers are primitive data types. Unlike other programming languages, Both integers and floating-point values are represented by JavaScript's number type. The IEEE-754 format is the one that is technically used by the JavaScript number type. Here, you donât need int, float, etc, to declar 3 min read JavaScript Object Programming Examples JavaScript Object is the collection of properties and the property is in key, value pair format. These objects are quite different from JavaScriptâs primitive data types (Number, String, Boolean, null, undefined, and symbol) in the sense that these primitive data types all store a single value each 6 min read JavaScript Set Programming Examples In JavaScript, the Set is a built-in collection that allows you to store unique values of any type, Set can store any type of value whether primitive or objects. It provides methods for adding, removing, and querying elements in an efficient way.JavaScriptlet s = new Set(["a", "b", "c"]); console.lo 1 min read JavaScript String Exercise JavaScript string is a primitive data type and is used for storing and manipulating a sequence of characters. It can contain zero or more characters within single or double quotes. This article contains a wide collection of JavaScript Programming examples based on String. JavaScriptlet s = "Geeksfor 7 min read Like