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
true
if an element with the specified value exists in theWeakSet
object; 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 # sec-weakset.prototype.has |
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