Web Reference: Feb 16, 2026 · Map objects are collections of key-value pairs. A key in the Map may only occur once; it is unique in the Map 's collection. A Map object is iterated by key-value pairs — a for...of loop returns a 2-member array of [key, value] for each iteration. Dec 20, 2024 · Each key in the HashMap is unique, and each key maps to a value. The HashMap allows you to retrieve, update, or delete values by using the associated key. In JavaScript, the Map object is an ideal implementation of the HashMap concept, which is part of the ECMAScript 6 (ES6) standard. Map keys can be any type (strings, numbers, objects, etc). The Map remembers the original insertion order of the keys. The number of items in a Map is easily retrieved using the size property. Maps are optimized for frequent additions and removals of key-value pairs.
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