JavaScript Reflect ownKeys() Method

Last Updated : 30 May, 2023

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.

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.

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.

JavaScript Reflect preventExtensions() Method

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