How do you compare Object and Map?

Objects and Maps both allow you to associate keys with values, retrieve those values, delete keys, and check if a key exists. Historically, Objects have been used as Maps, but there are several key differences that make Map a better choice in certain scenarios:

| Feature | Object | Map |
|--------------------------|-----------------------------------------------------|----------------------------------------------------------|
| Key Types | Only strings and symbols are valid keys | Any value can be used as a key (objects, functions, primitives) |
| 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 |
| 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 |