WeakSet in JavaScript is used to store a collection of objects. It adapts the same properties of that of a set i.e. does not store duplicates. The major difference of a WeakSet with the set is that a WeakSet is a collection of objects and not values of some particular type.
Syntax:
new WeakSet(object)
Parameters: Here parameter “object” is an iterable object. All the elements of the iterable object are added to the WeakSet.
Some different WeakSet functions:
| METHODS | DESCRIPTION |
|---|---|
| add(value) | a new object is appended with the given value to the weakset. WeakSet_Object.add(value) |
| delete(value) | Deletes the value from the WeakSet collection. WeakSet_Object.delete(value) |
| has(value) | Returns true if the value is present in the WeakSet Collection, false otherwise. WeakSet_Object.has(value) |
| length() | Returns the length of weakSetObject WeakSet_Object.length() |
JavaScript code to show the working of WeakSet() function:
<script> var weakSetObject = new WeakSet(); var objectOne = {}; var objectTwo = {}; // add(value) weakSetObject.add(objectOne); document.write("objectOne added <br>"); weakSetObject.add(objectTwo); document.write("objectTwo added <br>"); // has(value) document.write("WeakSet has objectTwo : " + weakSetObject.has(objectTwo)); // delete(value) weakSetObject.delete(objectTwo); document.write("<br>objectTwo deleted<br>"); document.write("WeakSet has objectTwo : " + weakSetObject.has(objectTwo)); </script> |
Output:
objectOne added objectTwo added WeakSet has objectTwo : true objectTwo deleted WeakSet has objectTwo : false
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