The Underscore.js _.quaternary() returns a new function that accepts only four arguments and passes these arguments to the given function. Additional arguments are discarded.
Syntax:
_.quaternary( fun )
Parameters: This method takes a single parameter as listed above and discussed below:
- fun: This is the given function passed as parameter.
Return Value: This method returns a new function.
Note: To execute the below examples, you have to install the underscore-contrib library by using this command prompt and execute the following command.
npm install underscore-contrib
Example 1:
// Defining underscore contrib variable var _ = require('underscore-contrib'); // Function function fun() { return arguments; } // Making quaternary function var gfgFunc = _.quaternary(fun); console.log("Arguments are :", gfgFunc(1, 2, 3, 4)); |
Output:
Arguments are : [Arguments] { '0': 1, '1': 2, '2': 3, '3': 4 }
Example 2: In this example, we will add arguments but only the first 4 arguments will be using this method.
// Defining underscore contrib variable var _ = require('underscore-contrib'); // Function function add() { s = 0 for(i = 0; i < 4; i++) { s += arguments[i] } return s; } // Making quaternary function var gfgFunc = _.quaternary(add); // Rest arguments are excluded console.log("Sum of first 4 arguments is :", gfgFunc(1, 2, 3, 4, 5, 6, 7)); |
Output:
Sum of first 4 arguments is : 10
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