Underscore.js _.binary() Method

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The Underscore.js _.binary() method returns a new function that accepts only two arguments and passes these arguments to the given function. Additional arguments are discarded.

Syntax:

_.binary( fun )

Parameters: This method takes a single parameter as listed above and discussed below.

fun: This is the given function.

Return Value: It 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:

Javascript

// Defining underscore contrib variable 
var _ = require('underscore-contrib');  
  
// Function 
function fun(){ 
    var mul = 1; 
     for (var i = 0; i < arguments.length; i++) { 
         mul = mul * arguments[i]; 
     } 
     return mul; 
} 
  
var gfgFunc = _.binary(fun); 
  
console.log("Multiplication is :", 
        gfgFunc(2,3));

Output:

Multiplication is : 6

Example 2:

Javascript

// Defining underscore contrib variable 
var _ = require('underscore-contrib');  
  
// Function 
function fun() { 
    var mul = 1; 
     for (var i = 0; i < arguments.length; i++) { 
         mul = mul * arguments[i]; 
     } 
     return mul; 
} 
  
var gfgFunc = _.binary(fun); 
  
// Only operates for first two parameters 
console.log("Multiplication is :",  
        gfgFunc(2,23,2,2)); 

Output:

Multiplication is : 46

Example 3:

Javascript

// Defining underscore contrib variable 
var _ = require('underscore-contrib');  
  
// Function 
function fun() { 
    return arguments; 
} 
  
var gfgFunc = _.binary(fun); 
  
// Only first two parameters will 
// be used as arguments 
console.log("Binary Arguments are :", 
    gfgFunc("a", "b", "c", "d", "e"));

Output:

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

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