JavaScript Map vs Object
Feature | Map | Object |
---|---|---|
Key Types | Any data type, including objects | Limited to strings and symbols |
Key Equality | Uses strict equality (=== ) |
Uses loose equality (== ), auto-converts to strings |
Iteration | Supports easy iteration (for...of , forEach ) |
Iteration through keys/values possible (for...in , Object.keys() ) |
Size | Has a size property |
No direct size property, count keys manually |
Performance | Efficient for frequent additions/removals | Efficient for simple data structures |
Methods | Provides various built-in methods (set , get , delete , has , etc.) |
Limited built-in methods for manipulation |
Key Order | Maintains the order of insertion | No guaranteed order of keys (may vary across JavaScript engines) |
Use Cases | Versatile, supports various key types | Simple key-value pairs, plain data structures |
Map vs Object in JavaScript
In JavaScript, both map and object stores the key-value pairs but differ on some features and use cases.