Open In App

JavaScript Reflect ownKeys() Method

Improve
Improve
Like Article
Like
Save
Share
Report

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.



Last Updated : 30 May, 2023
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads