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 = { Â Â Â Â name: "Raj", Â Â Â Â course: "DSA", Â Â Â Â website: "geeksforgeeks.org", } Â Â 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 = { Â Â Â Â name: "Raj", Â Â Â Â course: "DSA", Â Â Â Â website: "geeksforgeeks.org", } Â Â console.log(Object.hasOwn(details, 'name')); console.log('name' in details); Â Â 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"; Â Â 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
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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.
