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:Â
Javascript
// Defining underscore contrib variable var _ = require('underscore-contrib');Â Â Â // Function function fun(){ Â Â Â Â var mul = 1; Â Â Â Â Â for (var i = 0; i < arguments.length; i++) { Â Â Â Â Â Â Â Â Â mul = mul * arguments[i]; Â Â Â Â Â } Â Â Â Â Â return mul; } Â Â var gfgFunc = _.binary(fun); Â Â console.log("Multiplication is :", Â Â Â Â Â Â Â Â 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:Â
Multiplication is : 46
Example 3:
Javascript
// Defining underscore contrib variable var _ = require('underscore-contrib');Â Â Â // Function function fun() { Â Â Â Â return arguments; } Â Â var gfgFunc = _.binary(fun); Â Â // Only first two parameters will // be used as arguments console.log("Binary Arguments are :", Â Â Â Â gfgFunc("a", "b", "c", "d", "e")); |
Output:Â
Binary Arguments are : [Arguments] { '0': 'a', '1': 'b' }
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