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Underscore.js _.unary() Method

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The Underscore.js _.unary() method returns a new function that accepts only one argument and passes this argument to the given function. Additional arguments are discarded.

Syntax:

_.unary( 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 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: 




// Defining underscore contrib variable
var _ = require('underscore-contrib'); 
  
// Function
function fun() {
    return arguments;
}
  
// Making unary function
var gfgFunc = _.unary(fun);
  
console.log("Arguments are :"
    gfgFunc(1, 2, 3));


Output:

Arguments are : [Arguments] { '0': 1 }

Example 2:




// Defining underscore contrib variable
var _ = require('underscore-contrib'); 
  
// Function
function fun() {
    return arguments;
}
  
// Making unary function
var gfgFunc = _.unary(fun);
  
// Rest arguments are excluded
console.log("Arguments are :"
    gfgFunc(1, 2, 3, 4, 5, 6, 7, 8));


Output: 

Arguments are : [Arguments] { '0': 1 }

Example 3:




// Defining underscore contrib variable
var _ = require('underscore-contrib'); 
  
// Function
function fun(a){
    return a;
}
  
// Making unary function
var gfgFunc = _.unary(fun);
  
// Only one argument is passed
console.log("Best Platform :"
    gfgFunc("GeeksforGeeks"));


Output: 

Best Platform : GeeksforGeeks


Last Updated : 18 Sep, 2020
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