WeakSet.prototype.has()
The has() method returns a boolean indicating whether an
object exists in a WeakSet or not.
Syntax
has(value)
Parameters
value-
Required. The object to test for presence in the
WeakSet.
Return value
- Boolean
-
Returns
trueif an element with the specified value exists in theWeakSetobject; otherwisefalse.
Examples
Using the has method
var ws = new WeakSet();
var obj = {};
ws.add(window);
mySet.has(window); // returns true
mySet.has(obj); // returns false
Specifications
| Specification |
|---|
| ECMAScript Language Specification (ECMAScript) # sec-weakset.prototype.has |
Browser compatibility
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