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Underscore.js | _.compose() Function

  • Last Updated : 27 Apr, 2020

The _.compose() function is used to return the composition of the list of functions. The list of the function returns the value of the function that follows.

Syntax:

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_.compose(*functions)

Parameters: This function accept a single parameter as mentioned above and described below:

  • functions: It contains the list of function that to be executed.

Return Value: It returns the composition of list of functions.



Below examples illustrate the _.compose() function in Underscore.js:

Example 1:




<!DOCTYPE html>
<html>
  
<head>
    <script type="text/javascript" src=
    </script>
</head>
  
<body>
    <script type="text/javascript">
        var fun1 = function (addString) {
            return "Welcome to " + addString;
        };
  
        var fun2 = function (GFG) {
            return GFG;
        };
        var str = _.compose(fun1, fun2);
  
        console.log(str('GeeksforGeeks'));
    </script>
</body>
  
</html>

Output:

Example 2:




<!DOCTYPE html>
<html>
  
<head>
    <script type="text/javascript" src=
    </script>
</head>
  
<body>
    <script type="text/javascript">
        var fun1 = function (str1) {
            return 'Welcome' + str1 +
                '\nA computer science portal';
        };
  
        var fun2 = function (str2) {
            return ' to ' + str2.toLowerCase();
        };
        var str = _.compose(fun1, fun2);
  
        console.log(str('GEEKSFORGEEKS'));
    </script>
</body>
  
</html>

Output:




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