Web Reference: Feb 16, 2026 · The Map object holds key-value pairs and remembers the original insertion order of the keys. Any value (both objects and primitive values) may be used as either a key or a value. ES6 brought Maps, which are dictionaries from arbitrary values to arbitrary values. An instance of Map maps keys to values. A single key-value mapping is called an entry. There are three common ways of creating Maps. First, we can use the constructor without any parameters to create an empty Map: 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.
YouTube Excerpt: In this video we will look at some of the new data structures.
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