Saturday, October 18, 2025
HomeLanguagesJavascriptUnderscore.js _.extend() Function

Underscore.js _.extend() Function

The _.extend() function is used to create a copy of all of the properties of the source objects over the destination object and return the destination object. The nested arrays or objects will be copied by using reference, not duplicated.

Syntax:

_.extend(destination, *sources)

Parameters: This function accept two parameters as mentioned above and described below:

  • destination: This parameter holds the destination object file.
  • sources: This parameter holds the source object file.

Return Value: It returns a copy all of the properties of the source objects over the destination object, and return the destination object.

Example 1:




<!DOCTYPE html>
<html>
  
<head>
    <script type="text/javascript" src=
    </script>
</head>
  
<body>
    <script type="text/javascript">
  
        var obj1 = {
            key1: 'Geeks',
        };
  
        var obj2 = {
            key2: 'neveropen',
        };
  
        console.log(_.extend(obj1, obj2));
    </script>
</body>
  
</html>


Output:

Example 2:




<!DOCTYPE html>
<html>
  
<head>
    <script type="text/javascript" src=
    </script>
</head>
  
<body>
    <script type="text/javascript">
  
        var obj1 = {
            key1: 'Geeks',
        };
  
        var obj2 = {
            key2: 'neveropen',
        };
  
        console.log(_.extend({
            Company: 'neveropen',
            Address: 'Noida'
        }, {
            Contact: '+91 9876543210',
            Email: 'abc@gfg.com'
        }, {
            Author: 'Ashok'
        }));
    </script>
</body>
  
</html>


Output:

Dominic
Dominichttp://wardslaus.com
infosec,malicious & dos attacks generator, boot rom exploit philanthropist , wild hacker , game developer,
RELATED ARTICLES

Most Popular

Dominic
32361 POSTS0 COMMENTS
Milvus
88 POSTS0 COMMENTS
Nango Kala
6728 POSTS0 COMMENTS
Nicole Veronica
11892 POSTS0 COMMENTS
Nokonwaba Nkukhwana
11954 POSTS0 COMMENTS
Shaida Kate Naidoo
6852 POSTS0 COMMENTS
Ted Musemwa
7113 POSTS0 COMMENTS
Thapelo Manthata
6805 POSTS0 COMMENTS
Umr Jansen
6801 POSTS0 COMMENTS