JaScript Reflect.ownKeys() method in Javascript is used to return an array of the target object’s own property keys and it ignores the inherited properties.
Syntax:
Reflect.ownKeys( obj )
Parameters: This method accepts a single parameter as mentioned above and described below:
- Obj: This parameter holds the target object and it is used to get its own keys.
Return value: This method always returns the Array of the target object’s own property keys.
Exceptions: A TypeError is an exception given as the result when the target is not an Object.
Below examples illustrate the Reflect.ownKeys() method in JavaScript:
Example 1: In this example, we will return the keys of the object using the Reflect.ownKeys() method in JavaScript.
const object1 = { property1: 332,
property2: 2
}; const array1 = []; console.log(Reflect.ownKeys(object1)); console.log(Reflect.ownKeys(array1)); const obj = { ab: 5, bc: 5 }; const obj1 = { ab: 5, bc: 5, ca: 7 }; console.log(Reflect.ownKeys(obj)); console.log(Object.keys(obj1)); console.log(Reflect.ownKeys(obj1)); |
Output:
[ 'property1', 'property2' ] [ 'length' ] [ 'ab', 'bc' ] [ 'ab', 'bc', 'ca' ] [ 'ab', 'bc', 'ca' ]
Example 2: In this example, we will return the keys of the object using the Reflect.ownKeys() method in JavaScript.
console.log(Reflect.ownKeys({ z: 3, y: 2, x: 1 })); console.log(Reflect.ownKeys([])); let sym = Symbol. for ( 'comet' )
let sym2 = Symbol. for ( 'meteor' )
let obj = { [sym]: 0, 'val' : 0, '45' : 0, 'sdf' : 0,
[sym2]: 0, 'safss' : 0, '34' : 0, 'val2' : 0
} console.log(Reflect.ownKeys(obj)); let obj1 = Object.create({}, { hoo:
{ value: function () { return this .hoo; } }
}); console.log(Object.keys(obj1)); console.log(Reflect.ownKeys(obj1)); |
Output:
[ 'z', 'y', 'x' ] [ 'length' ] [ '34', '45', 'val', 'sdf', 'safss', 'val2', Symbol(comet), Symbol(meteor) ] [] [ 'hoo' ]
Supported Browsers: The browsers supported by JavaScript Reflect.ownKeys() method are listed below:
- Google Chrome 49 and above
- Edge 12 and above
- Firefox 42 and above
- Opera 36 and above
- Safari 10 and above
We have a complete list of Javascript Reflects methods, to check those go through the JavaScript Reflect Reference article.