Variadic Functions in JavaScript Last Updated : 19 Jun, 2024 Summarize Comments Improve Suggest changes Share Like Article Like Report Variadic functions are functions that can accept any number of arguments. In variadic functions no predefined number of function arguments is present that's why a function can take any number of arguments. Syntax:function NameOfFun( x1, x2, x3, ... ){ // function body}Below are the approaches by using we can create variadic functions in JavaScript: Table of Content Using arguments objectUsing Rest parameterUsing arguments objectWhile JavaScript does not have native support for variadic functions. The arguments object is available inside every function and allows you to access all arguments passed to the functions. Even arguments do not declare explicitly in function. An argument object is like an array of arguments of functions. Example: Creating a variadic function using an argument object JavaScript function SumOfNum() { let total = 0 for (let i = 0; i < arguments.length; i++) { total += arguments[i] } return total; } console.log("Sum is ", SumOfNum(1, 2, 3, 4)); console.log("Sum is ", SumOfNum(1, 2, 5)); OutputSum is 10 Sum is 8 Using Rest parameterThe rest parameter allows you to collect a variable number of arguments into an array parameter. To achieve variadic functions behavior using rest parameter, you can define a single argument inside a function using the rest operator. Example: We have created a function for the sum of numbers without explicitly defining a fixed number of function parameters. On calling the function twice with a different number of arguments, it produced the correct result without triggering any errors. JavaScript function SumOfNum(...numbers) { let total = 0 for (let i = 0; i < numbers.length; i++) { total += numbers[i] } return total; } console.log("Sum is ", SumOfNum(1, 2, 3, 4)); console.log("Sum is ", SumOfNum(1, 2, 5)); OutputSum is 10 Sum is 8 Comment More infoAdvertise with us Next Article Functions in JavaScript V vishalgupta703782 Follow Improve Article Tags : JavaScript javascript-basics Geeks Premier League 2023 Similar Reads Functions in JavaScript Functions in JavaScript are reusable blocks of code designed to perform specific tasks. They allow you to organize, reuse, and modularize code. It can take inputs, perform actions, and return outputs.JavaScriptfunction sum(x, y) { return x + y; } console.log(sum(6, 9)); // output: 15Function Syntax 5 min read JavaScript Course Functions in JavaScript Javascript functions are code blocks that are mainly used to perform a particular function. We can execute a function as many times as we want by calling it(invoking it). Function Structure: To create a function, we use function() declaration. // Anonymous function function(){ // function...body } / 4 min read eval() vs. Function() in JavaScript We will learn about JavaScript functions eval() and Function(). The eval() and Function() are used to evaluate any JavaScript expression passed to either of them as a string but the difference between them is how how they handle the expression. eval() The eval() method in JavaScript evaluates or exe 2 min read JavaScript Higher Order Functions A higher-order function is a function that does one of the following:Takes another function as an argument.Returns another function as its result.Higher-order functions help make your code more reusable and modular by allowing you to work with functions like any other value.JavaScriptfunction fun() 7 min read Functional programming in JavaScript Functions are the most important part of functional programming (especially in JavaScript). Functions are the single source that helps developers to perform functional programming. Generally abbreviated as FP which revolves around functions and it is how we use functions that makes our code function 7 min read JavaScript uneval() Function The uneval() is an inbuilt function in JavaScript that is used to create a string representation of the source code of an Object. Syntax: uneval(object) Note: This function has been DEPRECATED and is no longer recommended. Parameters: It accepts an object which may be a JavaScript expression or stat 2 min read Like