A JavaScript WeakMap object is a type of collection that is similar to a Map. Each element is stored as a key-value pair with a weakly referenced key. In this case, the keys are objects and the values are arbitrary.
Syntax
new WeakMap([iterable]) Parameter
iterable – Arrays and other iterable objects whose elements are key-value pairs are represented by this type.
Points to remember
- WeakMap objects support only keys of object types.
- In WeakMap, if there is no reference to a key object, the object is targeted for garbage collection.
- WeakMap does not enumerate its keys. As a result, it does not provide any method for retrieving the list of keys.
- WeakMap objects iterate their elements in insertion order.
JavaScript WeakMap Methods
| Methods | Description |
| delete() | The function deletes the specified element from the WeakMap object. |
| get() | Upon specifying a key, it returns its value. |
| has() | The value element indicates whether the WeakMap object contains the specified value. |
| set() | This method adds or updates key-value pairs to the WeakMap object. |