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 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. We can iterate over Map key/value pairs, so we should be able to .filter, .map, and all other normal things that you do with iterators. The methods available on the Map prototype are lacking compared with other languages.
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