Underscore.js | _.partial() Function

The _.partial() function is used to apply partially a function by filling in any number of its arguments, without changing its dynamic value.

Syntax:

_.partial(function, *arguments)

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

  • function: The function that need to be executed.
  • arguments: This parameter needs to add some symbols between elements.

Return Value: This function returns the result of partially executed function.

Below examples illustrate the _.partial() Function in Underscore.js:
Example 1:



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<!DOCTYPE html>
<html>
  
<head>
    <script type="text/javascript" src=
    </script>
</head>
  
<body>
    <script type="text/javascript">
  
        var product = function (num1, num2) {
            return num1 * num2;
        };
  
        prod = _.partial(product, 15);
        console.log(prod(18));
    </script>
</body>
  
</html>

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Output:

Example 2:

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<!DOCTYPE html>
<html>
  
<head>
    <script type="text/javascript" src=
    </script>
</head>
  
<body>
    <script type="text/javascript">
  
        var sum = function (num1, num2, num3) {
            return num1 + num2 + num3;
        };
  
        sum = _.partial(sum, 15, 25);
        console.log(sum(18));
    </script>
</body>
  
</html>

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Output:

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