A Set has no keys, so the entries() method returns [value,value]. This makes Sets compatible with Maps. // Create a Set const letters = new Set(["a","b","c"]); // Get all Entries const myIterator = letters.entries(); // List all Entries let text = ""; for (const entry of myIterator) { text += entry; } Try it Yourself »

June 24, 2024 - Since Firefox 127, these methods are available in most major browser engines, which means you won't need a polyfill to make them work everywhere. This article is a good read for people who are new to Set in JavaScript and are looking to find out how to use these new JavaScript methods.

June 11, 2024 - There are two primary ways to create sets in JavaScript: ... const mySet = new Set(); // Adding elements mySet.add("John"); mySet.add("Sherlock"); mySet.add("Watson"); mySet.add("Moriarty"); // Duplicate, ignored console.log(mySet); // Output: Set(3) {"John", "Sherlock", "Watson"} Size: The size property returns the number of unique elements in the set. const mySet = new Set([1, 2, 3]); console.log(mySet.size); // Output: 3 · Entries: The entries() method returns an iterator that allows you to loop through each element and its corresponding index in the set.

A JavaScript Set is a collection of unique values.

June 26, 2024 - Simplify your set operations using the following methods: intersection() returns a new set containing elements in both this set and the given set. const odds = new Set([1, 3, 5, 7, 9]); const squares = new Set([1, 4, 9]); console.log(odds.intersection(squares)); // Set(2) { 1, 9 } union() returns a new set containing all elements in this set and the given set. const evens = new Set([2, 4, 6, 8]); const squares = new Set([1, 4, 9]); console.log(evens.union(squares)); // Set(6) { 2, 4, 6, 8, 1, 9 }

August 13, 2026 - A set-like object is an object that provides the following: A size property that contains a number. A has() method that takes an element and returns a boolean.

April 29, 2024 - A Set has no keys, so the entries() method returns [value,value]. This makes Sets compatible with Maps. ... // Create a Set const letters = new Set(["a","b","c"]); // Get all Entries const myIterator = letters.entries(); // List all Entries let text = ""; for (const entry of myIterator) { text += entry; } Congratulations! You’ve now reached the end of our journey through JavaScript Set Methods.

August 24, 2025 - Sets in JavaScript/TypeScript are a powerful tool for handling collections of unique values. With methods like add(), delete(), has(), and advanced operations like union and intersection, they simplify many common programming tasks.

July 13, 2024 - TL;DR: JavaScript’s Set data structure has added 7 new APIs that are very useful and can reduce the need for libraries like lodash.

July 10, 2024 - In any other language a set type without these would be considered incomplete, like an array/list without a method for checking the length or a way to iterate over the elements. ... ES6 sets. Why no intersection? ... Benchmark driven development in JavaScript (Set vs.

July 27, 2025 - JavaScript Set Features · Let’s come back to our scraping problem. Suppose we have a list of product IDs like this: const productIds = [101, 102, 103, 102, 101, 104]; We want to remove the duplicates. With Set, it's a one-liner: const uniqueProductIds = [...new Set(productIds)]; console.log(uniqueProductIds); // [101, 102, 103, 104] That’s it. Problem solved. Here’s a quick reference to the most useful Set methods: mySet.add(50); mySet.delete(10); // true if deleted ·

February 10, 2023 - How to use the has method in a set c. How to use the delete method in a set d. How to use the clear method in a set e. How to use the entries method in a set f. How to use the values method in a set g. How to use the size property in a set h. How to use forEach in a set i.

October 12, 2023 - The values which are in a set can ... we will see some of the available methods of sets set in javascript like add, size, forEach, has, delete and clear....

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September 4, 2024 - The intersection method returns a new Set containing elements present in both the original Set and the provided Set. Let’s see it in action. /** * A Set of mapaches' names; the duplicate "Apollo" will be removed.

October 30, 2021 - This method accepts the value of the element to add to the Set object as a parameter, and returns the new Set object with added value.

You can list all Set elements (values) with a for..of loop:

June 26, 2024 - Maybe one self-contained example w/ a new function you can copy/paste into the console to play around with would be cool · I was mostly using it as a test to see if it worked in Chrome so I could start using it

const people = ["chris", "chris", "cindy"]; const peopleSet = new Set(people); peopleSet.add("chris"); console.log(peopleSet); // {"chris","cindy"}Code language: JavaScript (javascript) Now they are even more useful with recently universally available methods, as Brian Smith summarizes: