The WeakSet
constructor lets you create
WeakSet
objects that store weakly held objects in a collection.
Syntax
new WeakSet([iterable]);
Parameters
- iterable
- If an iterable
object is passed, all of its elements will be added to the new
WeakSet
. null is treated as undefined.
Examples
Using the WeakSet object
var ws = new WeakSet();
var foo = {};
var bar = {};
ws.add(foo);
ws.add(bar);
ws.has(foo); // true
ws.has(bar); // true
ws.delete(foo); // removes foo from the set
ws.has(foo); // false, foo has been removed
ws.has(bar); // true, bar is retained
Note that foo !== bar
. While they are similar objects, they are not
the same object. And so they are both added to the set.
Specifications
Browser compatibility
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