JavaScript Set size Property Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report The Set.size property in JavaScript returns the number of elements in a Set. In other words, we can say that this property is used to get the current size of the set. If the Set is empty the size of the set will be returned as 0.Syntax:mySet.sizeReturn Type:Number of elements in the setExample 1: In this example, we will see the use of the Javascript Set.size property. JavaScript // Create a new set using Set() constructor let myset = new Set(); // Append new elements to the // set using add() method myset.add(23); myset.add(12); // Print the modified set console.log(myset); // As the set has 2 elements, // it will return 2. console.log(myset.size); Output:Set(2) { 23, 12 }2Example 2: In this example, we will see the use of the Javascript Set.size property. JavaScript // Creating a new set let mySet = new Set(); mySet.add('Manchester'); mySet.add('London'); mySet.add('Norwich'); console.log(mySet.size); Output:3Supported Browsers:Google ChromeFirefoxOperaEdgeSafari Comment S shinjanpatra Follow Improve S shinjanpatra Follow Improve Article Tags : JavaScript Web Technologies JavaScript-Properties ES6 JavaScript-Set +1 More Explore JavaScript BasicsIntroduction to JavaScript4 min readVariables and Datatypes in JavaScript6 min readJavaScript Operators5 min readControl Statements in JavaScript4 min readArray & StringJavaScript Arrays7 min readJavaScript Array Methods7 min readJavaScript Strings5 min readJavaScript String Methods9 min readFunction & ObjectFunctions in JavaScript5 min readJavaScript Function Expression3 min readFunction Overloading in JavaScript4 min readObjects in JavaScript4 min readJavaScript Object Constructors4 min readOOPObject Oriented Programming in JavaScript3 min readClasses and Objects in JavaScript4 min readWhat Are Access Modifiers In JavaScript ?5 min readJavaScript Constructor Method7 min readAsynchronous JavaScriptAsynchronous JavaScript2 min readJavaScript Callbacks4 min readJavaScript Promise4 min readEvent Loop in JavaScript4 min readAsync and Await in JavaScript2 min readException HandlingJavascript Error and Exceptional Handling6 min readJavaScript Errors Throw and Try to Catch2 min readHow to create custom errors in JavaScript ?2 min readJavaScript TypeError - Invalid Array.prototype.sort argument1 min readDOMHTML DOM (Document Object Model)9 min readHow to select DOM Elements in JavaScript ?3 min readJavaScript Custom Events4 min readJavaScript addEventListener() with Examples9 min readAdvanced TopicsClosure in JavaScript4 min readJavaScript Hoisting6 min readScope of Variables in JavaScript3 min readJavaScript Higher Order Functions7 min readDebugging in JavaScript4 min read Like