Underscore.js _.partial() Function

Last Updated : 24 Nov, 2021
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: html 
<!DOCTYPE html>
<html>

<head>
    <script type="text/javascript" src=
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore-min.js">
    </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>
Output: Example 2: html 
<!DOCTYPE html>
<html>

<head>
    <script type="text/javascript" src=
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore-min.js">
    </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>
Output:
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