Object.prototype.__lookupSetter__()
Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. 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.
Syntax
__lookupSetter__(sprop)
Parameters
sprop
-
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.
Description
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()
.
Examples
Standard-compliant and non-standard ways to get a property setter
var obj = {
set foo(value) {
this.bar = value;
}
};
// Non-standard and deprecated way
obj.__lookupSetter__('foo')
// (function(value) { this.bar = value; })
// Standard-compliant way
Object.getOwnPropertyDescriptor(obj, 'foo').set;
// (function(value) { this.bar = value; })
Specifications
Specification |
---|
ECMAScript Language Specification # sec-object.prototype.__lookupSetter__ |
Browser compatibility
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