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JavaScript Object isSealed() Method
Last Updated :
19 Jun, 2023
JavaScript object.isSealed() method is used to determine if an object is sealed or not. An object is sealed if all of the below-mentioned conditions hold true :
- If it is not extensible.
- If all of its properties are non-configurable.
- If it is not removable (but not necessarily non-writable).
Object.isSealed() takes the object as an argument that has to be checked and returns a boolean representing whether the object is sealed or not.
Syntax:
Object.isSealed(obj)
Parameters:
- obj: It is the object which has to be checked.
Return Value: Object.isSealed() returns a boolean representing whether the object is sealed or not.
Examples of the above function are provided below.
Example 1: In the above example the object has not been sealed using the Object.seal() method, therefore, it returns false when it is checked using Object.isSealed() method.
JavaScript
// creating an object constructor
// and assigning values to it
const object = {
property: 'hi geeksforgeeks'
};
// checking whether the object
// is sealed or not
console.log(Object.isSealed(object));
Output:
false
Example 2: In the above example the object has been sealed using the Object.seal() method, therefore, it returns true when it is checked using Object.isSealed() method.
JavaScript
// creating an object constructor
// and assigning values to it
const object = {
property: 'hi geeksforgeeks'
};
// Using seal() method to seal the object
Object.seal(object);
// checking whether the
// object is frozen or not
console.log(Object.isSealed(object));
Output:
true
Applications:
- Object.isSealed() is used for checking whether an object is sealed or not.
Exceptions :
- It causes a TypeError if the argument passed is not an object.
- If an object is not passed as an argument to the method, then it treats it as a sealed object and returns true.
We have a complete list of Javascript Object methods, to check those please go through this JavaScript Object Complete Reference article.
Supported Browsers:
- Chrome 6 and above
- Edge 12 and above
- Firefox 4 and above
- Internet Explorer 9 and above
- Opera 12 and above
- Safari 5.1 and above
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