Underscore.js _.rcurry2() Method

The Underscore.js _.rcurry2() method returns a curried version of the given function where a maximum of two arguments are processed from right to left.

Syntax:

_.rcurry2( 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 curried 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 div(a, b) {
    return a/b;
}

var curried = _.rcurry2(div);

console.log("Curried division is :",
    curried(4)(16));

Output:

Curried division is : 4

Example 2:

// Defining underscore contrib variable
var _ = require('underscore-contrib');

// Function
function sub(a, b) {
    return a-b;
}

var curried = _.rcurry2(sub);

console.log("Curried Subtraction is :",
    curried(2)(4));

Output: 

Curried Subtraction is : 2

Example 3: Reversed Arguments shown below:

// Defining underscore contrib variable
var _ = require('underscore-contrib');

// Function
function div(a, b) {
    return ("a="+a+" and b="+b);
}

var curried = _.rcurry2(div);

console.log(curried("a")("b"));

Output: 

a=b and b=a