WeakRef.prototype.deref()
The deref
method returns the WeakRef
instance's target
object, or undefined
if the target object has been garbage-collected.
Syntax
obj = ref.deref();
Return value
The target object of the WeakRef, or undefined
if the object has been
garbage-collected.
Notes
See the Notes
on WeakRefs section of the WeakRef
page for some important notes.
Examples
Using deref
See the Examples
section of the WeakRef
page for the complete example.
const tick = () => {
// Get the element from the weak reference, if it still exists
const element = this.ref.deref();
if (element) {
element.textContent = ++this.count;
} else {
// The element doesn't exist anymore
console.log("The element is gone.");
this.stop();
this.ref = null;
}
};
Specifications
Specification |
---|
ECMAScript (ECMA-262) The definition of 'WeakRef.prototype.deref()' in that specification. |
Browser compatibility
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