Web Reference: Learn how to use map() to create a new array from calling a function for every array element. See examples, syntax, parameters, return value and browser support for map(). 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. Sep 23, 2025 · A JavaScript Map holds key-value pairs and similar to Hash Map or Dictionary in other languages. Preserves the original insertion order. Supports any type, including objects and primitives, as keys or values. This feature allows for efficient data retrieval and manipulation.
YouTube Excerpt: 00:00:00 introduciton 00:00:16 example 1 00:02:13 example 2 00:03:58 example 3 // .
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