The static Reflect.getOwnPropertyDescriptor() method is similar to Object.getOwnPropertyDescriptor(). It returns a property descriptor of the given property if it exists on the object, undefined otherwise.
Reflect.getOwnPropertyDescriptor()
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Syntax
Reflect.getOwnPropertyDescriptor(target, propertyKey)
Parameters
-
target -
The target object in which to look for the property.
-
propertyKey -
The name of the property to get an own property descriptor for.
Return value
A property descriptor object if the property exists in target object; otherwise, undefined.
Exceptions
Description
The Reflect.getOwnPropertyDescriptor method returns a property descriptor of the given property if it exists in the target object, undefined otherwise. The only difference to Object.getOwnPropertyDescriptor() is how non-object targets are handled.
Examples
Using Reflect.getOwnPropertyDescriptor()
Reflect.getOwnPropertyDescriptor({x: 'hello'}, 'x') // {value: "hello", writable: true, enumerable: true, configurable: true} Reflect.getOwnPropertyDescriptor({x: 'hello'}, 'y') // undefined Reflect.getOwnPropertyDescriptor([], 'length') // {value: 0, writable: true, enumerable: false, configurable: false}
Difference to Object.getOwnPropertyDescriptor()
If the target argument to this method is not an object (a primitive), then it will cause a TypeError. With Object.getOwnPropertyDescriptor, a non-object first argument will be coerced to an object at first.
Reflect.getOwnPropertyDescriptor('foo', 0) // TypeError: "foo" is not non-null object Object.getOwnPropertyDescriptor('foo', 0) // { value: "f", writable: false, enumerable: true, configurable: false }
Specifications
Browser compatibility
| Desktop | Mobile | Server | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | Deno | Node.js | |
getOwnPropertyDescriptor |
49
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12
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42
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No
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36
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10
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49
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49
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42
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36
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10
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5.0
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1.0
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6.0.0
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See also
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getOwnPropertyDescriptor
