Underscore.js _.curry2() Method

The Underscore.js _.curry2() method returns a curried version of the given function but will curry exactly two arguments, no more or less.

Syntax:

_.curry2( 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: 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: 

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

// Function
function fun(a, b) {
    return a*b;
}

// Making curried function
var gfgFunc = _.curry2(fun);

// Only operates for exactly two arguments
console.log("Multiplication is :",
    gfgFunc(20)(23));

Output:

Multiplication is : 460

Example 2:

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

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

// Making curried function
var gfgFunc = _.curry2(fun);

// Only operates for exactly two arguments
console.log("Subtraction is :",
    gfgFunc(25)(23));

Output: 

Subtraction is : 2

Example 3: Printing the arguments taken by the curry2() function.

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

// Function
function fun(x, y) {
    return arguments;
}

// Making curried function
var gfgFunc = _.curry2(fun);

// Only operates for exactly two arguments
console.log("Curried Arguments are :",
    gfgFunc("a")("b"));

Output: 

Curried Arguments are : [Arguments] { '0': 'a', '1': 'b' }