WeakSet.prototype.add()
The add()
method appends a new object to the end of a
WeakSet
object.
Syntax
add(value)
Parameters
- value
-
Required. The object to add to the
WeakSet
collection.
Return value
The WeakSet
object.
Examples
Using add
var ws = new WeakSet();
ws.add(window); // add the window object to the WeakSet
ws.has(window); // true
// WeakSet only takes objects as arguments
ws.add(1);
// results in "TypeError: Invalid value used in weak set" in Chrome
// and "TypeError: 1 is not a non-null object" in Firefox
Specifications
Specification |
---|
ECMAScript Language Specification # sec-weakset.prototype.add |
Browser compatibility
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