Map vs Object in JS

A Map is similar to an Object, but has a few differences:

• Preserves insertion order of keys
• Has better performance for frequent additions/removals/lookups (e.g. .set)
• Does not have native support for serialising or parsing (i.e. works less well with JSON)
• Easier to get the size, using .size
• Does not contain any keys by default, unlike Object which has a prototype

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map#objects_vs._maps

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