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JavaScript Object defineProperty() Method

JavaScript Object defineProperty() Method with example on javascript, object, javascript assign(), create(), defineProperties(), defineProperty(), entries(), freeze(), javascript tutorial, javascript array etc.

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JavaScript Object.defineProperty() Method

The Object.defineProperty() method defines a new property directly on an object and returns the object. To change the flags, we can use Object.defineProperty. We cannot change it back, because define property doesn?t work on non-configurable properties.

Syntax:

Object.defineProperty(obj, prop, descriptor)

Parameter

Obj: The Object on which to define the property.

Prop: The name of a property to be defined or modified.

Descriptor: The descriptor for the property being defined or modified.

Return:

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

Browser Support:

Chrome Yes
Edge Yes
Firefox 1.5
Opera Yes

Example 1

const object1 = {};
Object.defineProperty(object1, 'property1', {
  value: 22, } );
  object1.property1;
    // throws an error in strict mode
console.log(object1.property1);

Output:

22

Example 2

const object1 = {};
Object.defineProperty(object1, 'property1', {
  value: 42,
  value: 52,
  value: 542,
  });
object1.property1 = 177;
// throws an error in strict mode
console.log(object1.property1);

Output:

542

Example 3

const object1 = {};
Object.defineProperty(object1, 'property1', {
  
  value: 2,
  value: 4,
  value: 4+13,
  });
object1.property1 ;
console.log(object1.property1);

Output:

17

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