Web Reference: 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. 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. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
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