JavaScript Object.defineProperties() Method

The Object.defineProperties() method in JavaScript is a standard built-in Object that defines a new or modifies existing properties directly on an object and it returns the object.

Syntax:

Object.defineProperties(obj, props) 

Parameter:

• Obj: This parameter holds the object on which the properties are going to be defined or modified.
• Props: This parameter is an object whose own enumerable properties constitute descriptors for the properties to be defined or modified.

Return Value: This method returns an object which is passed as an argument to the function.

Below examples illustrate the Object.defineProperties() method in JavaScript:

Example 1: In this example, we will define new properties to an object using the Object.defineProperties() method in JavaScript.

javascript

<script>
    const geek = {};

    Object.defineProperties(geek, {
      prop1: {
        value: "geeksforgeeks",
        writable: true
      },
      prop2: {}
    });

    console.log(geek.prop1);
    console.log(geek.prop2);
</script>

Output:

"geeksforgeeks"
undefined

Example 2: In this example, we will define new properties and modify some properties of an object using the Object.defineProperties() method in JavaScript.

javascript

<script>
    var geek = {};
    Object.defineProperties(geek, {
      'prop1': {
        value: "Geeks",
        writable: true
      },
      'prop2': {
        value: 'Hello',
        writable: false
      }
    });
    console.log(geek.prop2);
    console.log(geek.prop1);

    const geek1 = {};
    Object.defineProperties(geek1, {
      prop1: {
        value: "Hi",
        value: "Hello",
        value: "Namaste",
      },
      prop2: {
        value: " And ", },
        prop3: {
        value: "learn",
       value: "Stay Safe", }
    });

    console.log(geek1.prop1, geek1.prop2, geek1.prop3);
</script>

Output:

"Hello"
"Geeks"
"Namaste" " And " "Stay Safe"

We have a complete list of Javascript Object methods, to check those please go through this JavaScript Object Complete Reference article.

Supported Browsers: The browsers supported by Object.defineProperties() method are listed below: 

• Google Chrome 6.0 and above
• Internet Explorer 9.0 and above
• Mozilla 4.0 and above
• Opera 11.1 and above
• Safari 5.0 and above