Underscore.js _.chain() Function

Last Updated : 10 Jan, 2024

Underscore.js _.chain() function is an inbuilt function in the Underscore.js library of JavaScript which is used to find a wrapped object. Moreover, invoking the methods on this object will continue to return the wrapped objects until the value is invoked.

Syntax:

_.chain(obj);

Parameters:

obj: It is the stated object.

Return Value:

This method returns a wrapped object.

Example 1: In this example, we are using the Underscore.js _.chain() function.

HTML

<!DOCTYPE html>
<html lang="en">
 
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
 
<body>
    <!DOCTYPE html>
    <html>
 
    <head>
        <script src=
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore-min.js">
        </script>
    </head>
 
    <body>
        <script>
            console.log(_.chain([99, 3, 4, 6]).push(100)); 
        </script>
    </body>
 
    </html>
 
</body>
 
</html>

Output:

[99, 3, 4, 6, 100]

Example 2: In this example, we are using the Underscore.js _.chain() function.

javascript

<!DOCTYPE html>
<html>
 
<head>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore-min.js">
    </script>
</head>
 
<body>
    <script>
        let author_article = [
            { author: 'Nidhi1352', articles: 792 },
            { author: 'Nisha95', articles: 590 },
            { author: 'Rohit01', articles: 450 }
        ];
 
        let experienced = _.chain(author_article)
            .sortBy(function (author_article) { return author_article.article; })
            .map(function (author_article) {
                return author_article.author +
                    ' wrote ' + author_article.articles
                    + ' articles! ';
            })
            .first()
            .value();
        console.log(experienced); 
    </script>
</body>
 
</html>