JavaScript Object.freeze() Method

The Object.freeze() method freezes an object that prevents new properties from being added to it. This method prevents the modification of existing property, attributes, and values.

Syntax:

Parameter

Obj: The object to freeze.

Return value:

This method returns the object that was passed to the function.

Browser Support:

Chrome	45.0
Edge	12.0
Firefox	32.0
Opera	No

Example 1

const object1 = {
  property1: 22
};
const object2 = Object.freeze(object1);
object2.property1 = 33;
// Throws an error in strict mode
console.log(object2.property1);

Output:

Example 2

const obj1 = { property1: 'freeze'};
const obj2 = Object.freeze(obj1);
obj2.property1 = 'new_data';
  console.log(obj2.property1);

Output:

" freeze "

Example 3

 var obj = { prop: function() {}, name: 'charry' };
        console.log(obj);
        obj.name = 'karri';
        delete obj.prop;
        console.log(obj);
        var o = Object.freeze(obj);
        obj.name = 'chris';
        console.log(obj);

Output:

[object Object] {
 name: "charry",
  prop: function() {}
}
[object Object] {
 name: "karri"
}
[object Object] {
 name: "karri"
}

Next TopicJavaScript Objects

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