Web Reference: Jan 16, 2026 · In JavaScript, Set and Map are built-in data structures used to store ordered collections of data, where Set holds unique values and Map stores data as key–value pairs. Feb 21, 2024 · In this tutorial, we will see how Map and Set work in detail and when to use them. We will also explore the Set object composition methods that were recently added to the JavaScript standard. Nov 14, 2022 · Map is a collection of keyed data items, just like an Object. But the main difference is that Map allows keys of any type. Methods and properties are: new Map() – creates the map. map.set(key, value) – stores the value by the key. map.get(key) – returns the value by the key, undefined if key doesn’t exist in map.
YouTube Excerpt: In this video we will look at some of the new data structures. ES6 Introduced
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