JavaScript Map Reference
Complete Set Reference
Revised July 2025
| Method | Description |
|---|---|
| new Map() | Creates a new Map object |
| clear() | Removes all the elements from a Map |
| delete() | Removes a Map element specified by a key |
| entries() | Returns an iterator object with the [key, value] pairs in a Map |
| forEach() | Invokes a callback for each key/value pair in a Map |
| get() | Gets the value for a key in a Map |
| groupBy() | Groups object elements according to returned callback values |
| has() | Returns true if a key exists in a Map |
| keys() | Returns an iterator object with the keys in a Map |
| set() | Sets the value for a key in a Map |
| size | Returns the number of Map elements |
| values() | Returns an iterator object of the values in a Map |
Complete JavaScript Reference
For a complete reference to all JavaScript properties and methods, with full descriptions and many examples, go to:
W3Schools' Full JavaScript Reference.
The reference inludes all JavaScript updates from 1999 to 2025.
