JavaScript Set has() Method Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report The Set.has() method in JavaScript is used to check whether an element with a specified value exists in a Set or not. It returns a boolean value indicating the presence or absence of an element with a specified value in a Set.Syntax:mySet.has(value);Parameters:value: It is the value of the element that has to be checked if it exists in the Set.Example 1: In this example, we have used sethas() method. 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); // As 23 exists 23, it will return true console.log(myset.has(23)); Outputtrue Example 2: In this example, we have used sethas() method. JavaScript // Create a new set using Set() constructor let myset = new Set(); // Append new elements to the // set using add() method myset.add("Chicago"); myset.add("California"); myset.add("London"); // As London exists in the set, // it will return true console.log(myset.has("London")); // As Manchester does not exist in the // set, it will return false console.log(myset.has("Manchester")); Outputtrue false Supported Browsers:Chrome Edge Firefox Opera Safari Comment More info S shinjanpatra Follow Improve Article Tags : JavaScript Web Technologies JavaScript-Methods JavaScript-Set 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 Strings6 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 readJavascript Scope3 min readJavaScript Higher Order Functions7 min readDebugging in JavaScript4 min read Like