JavaScript Object hasOwn() Method
JavaScript hasOwn() method is used to check if the object has the specified property or not. It returns true if the property exists else false. This method was introduced as a replacement for the Object.hasOwnProperty() method. It is different from in operator as it does not check for inherited properties.
Syntax:
Object.hasOwn(obj, prop)
Parameters: This method takes two parameters
- obj: This is the JavaScript object on which the check is to be applied
- prop: It is the property on which the check is to be applied
Return Value: A boolean value true if exists else false.
Example 1: This example uses the hasOwn() method to check if a property exists or not
Javascript
let details = { name: "Raj" , course: "DSA" , website: "w3wiki.net" , } console.log(Object.hasOwn(details, 'name' )); console.log(Object.hasOwn(details, 'course' )); console.log(Object.hasOwn(details, 'phone number' )); |
Output:
true true false
Example 2: This example will compare the in operator and Object.hasOwn() method.
Javascript
let details = { name: "Raj" , course: "DSA" , website: "w3wiki.net" , } console.log(Object.hasOwn(details, 'name' )); console.log( 'name' in details); console.log(Object.hasOwn(details, 'toString' )); console.log( 'hasOwnProperty' in details); |
Output: The in operator returns true for even inherited properties like toString is an inherited method for all JavaScript objeccts.
true true false true
Example 3: This method compares the hasOwnProperty() method and hasOwn() method.
Javascript
let details = Object.create( null ); details.course = "DSA" ; console.log(Object.hasOwn(details, "course" )); console.log(Object.hasOwnProperty(details, "course" )) |
Output: The hasOwnProperty() method does not work on null objects but hasOwn() method works. So it is better than hasOwnProperty() method
Supported Browsers:
- Chrome
- Edge
- Firefox
- Opera
- Safari
We have a complete list of Object methods, and properties to check those please go through this JavaScript Object Reference article.
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