The Underscore.js _.curry() method returns a curried version of the given function. If the reverse is true, arguments will be processed from right to left.
Syntax:
_.curry( fun, reverse )
Parameters: This method takes two parameters as listed above and discussed below.
- fun: This is the given function.
- reverse: It is an optional parameter and determines whether the arguments will be reversed or not
Return Value: It returns a curried version of the 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:
Javascript
// Defining underscore contrib variable var _ = require('underscore-contrib'); // Function function fun(a, b, c, d){ return a + b + c + d; } // Making curried function var gfgFunc = _.curry(fun); // Only operates for arguments same // as the number in function console.log("Addition is :", gfgFunc(2)(23)(2)(3)); // Not adds for less arguments console.log(gfgFunc(1)(2)); |
Output:
Addition is : 30 [Function: mustBeUnary]
Example 2:
Javascript
// Defining underscore contrib variable var _ = require('underscore-contrib'); // Function function fun(a, b, c) { return a * b * c; } // Making curried function var gfgFunc = _.curry(fun); // Only operates for arguments same // as the number in function console.log("Multiplication is :", gfgFunc(2)(23)(2)); // Not multiplies for less arguments console.log(gfgFunc(1)(2)); |
Output:
Multiplication is : 92 [Function: mustBeUnary]
Example 3: Arguments are processed right to left for reversed = true.
Javascript
// Defining underscore contrib variable var _ = require('underscore-contrib'); // Function function fun(a, b, c){ return arguments; } // Making curried function var gfgFunc = _.curry(fun,true); // Only operates for arguments same // as the number in function console.log("curried arguments are :", gfgFunc("arg1")("arg2")("arg3")); |
Output: Arguments are stored in reverse order.
curried arguments are : [Arguments]
{ '0': 'arg3', '1': 'arg2', '2': 'arg1' }
Example 4: Arguments are processed left to right for reversed = false.
Javascript
// Defining underscore contrib variable var _ = require('underscore-contrib'); // Function function fun(a, b, c){ return arguments; } // Making curried function var gfgFunc = _.curry(fun,false); // Only operates for arguments same // as the number in function console.log("curried arguments are :", gfgFunc("arg1")("arg2")("arg3")); |
Output:
curried arguments are : [Arguments]
{ '0': 'arg1', '1': 'arg2', '2': 'arg3' }
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