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This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Avoid using it and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

The __lookupSetter__ method returns the function bound as a setter to the specified property.




A string containing the name of the property whose setter should be returned.

Return value

The function bound as a setter to the specified property.


If a setter has been defined for an object's property, it was not possible to reference the setter function through that property, because that property refers to the return value of that function. __lookupSetter__ can be used to obtain a reference to the setter function.

It is now possible to do this in a standardized way using Object.getOwnPropertyDescriptor().


var obj = {
  set foo(value) {
    this.bar = value;

// Non-standard and deprecated way
// (function(value) { this.bar = value; })

// Standard-compliant way
Object.getOwnPropertyDescriptor(obj, 'foo').set;
// (function(value) { this.bar = value; })


Specification Status Comment
ECMAScript Latest Draft (ECMA-262)
The definition of 'Object.prototype.__lookupSetter__()' in that specification.
Living Standard Included in the (normative) annex for additional ECMAScript legacy features for Web browsers (note that the specification codifies what is already in implementations).

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes Yes Yes11 Yes Yes
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidIE mobileOpera AndroidiOS Safari
Basic support Yes Yes Yes Yes Yes Yes Yes

See also

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