WeakRef() constructor

The WeakRef() constructor creates WeakRef objects.

Syntax

js
new WeakRef(target)

Note: WeakRef() can only be constructed with new. Attempting to call it without new throws a TypeError.

Parameters

target

The target value the WeakRef should refer to (also called the referent). Must be an object or a non-registered symbol.

Return value

A new WeakRef object referring to the given target value.

Exceptions

TypeError

Thrown if target is not an object or a non-registered symbol.

Examples

Creating a new WeakRef object

See the main WeakRef page for a complete example.

js
class Counter {
  constructor(element) {
    // Remember a weak reference to a DOM element
    this.ref = new WeakRef(element);
    this.start();
  }
}

Specifications

Specification
ECMAScript Language Specification
# sec-weak-ref-constructor

Browser compatibility

Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
Deno
Node.js
WeakRef() constructor

See also