Web Reference: Because of this, Objects have been used as Maps historically; however, there are important differences between Objects and Maps that make using a Map better. An Object has a prototype, so there are default keys in the map. Jul 25, 2025 · JavaScript Maps are powerful data structures that often go underutilized by developers. Unlike regular objects, Maps provide a clean way to store key-value pairs with better performance characteristics and more flexible key types. Jul 12, 2025 · For read heavy operations where strings are keys, Objects provide better performance. Object allows only Strings and Symbols as keys, but Map maintains key order and allows any data type (including objects) as keys.
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