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Clarify prototype behavior of Map in README #359

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Clarify prototype behavior of Map in README #359

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2 changes: 1 addition & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -951,7 +951,7 @@
| **Key Order** | Keys are unordered (in practice, insertion order is mostly preserved for string keys, but not guaranteed) | Keys are ordered by insertion; iteration follows insertion order |
| **Size Property** | No built-in way to get the number of keys; must use `Object.keys(obj).length` | Use the `.size` property for the number of entries |
| **Iterability** | Not directly iterable; must use `Object.keys`, `Object.values`, or `Object.entries` | Directly iterable with `for...of`, `.keys()`, `.values()`, `.entries()` |
| **Prototype** | Has a prototype chain; may have default properties that can collide with custom keys (can be avoided with `Object.create(null)`) | Does not have a prototype, so there are no default keys |
| **Prototype** | Has a prototype chain; may have default properties that can collide with custom keys (can be avoided with `Object.create(null)`) | Map does not traverse the prototype chain for key lookup |
| **Performance** | May be less efficient for frequent additions/removals | Optimized for frequent additions and deletions |
| **Serialization** | Can be easily serialized to JSON | Cannot be directly serialized to JSON |

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