Underscore.js _.functionalize() Method

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The _.functionalize() method takes a function (one which uses this) and pushes this into the argument list. The returned function uses its first argument as the receiver/context of the original function, and the rest of the arguments are used as the original’s entire argument list.

Syntax:

_.functionalize( function )

Parameters: This method takes a function that uses this.

Return Value: This method returns a function.

Note: This will not work in normal JavaScript because it requires the underscore.js contrib library to be installed Underscore.js contrib library can be installed using npm install underscore-contrib –save.

Example 1:

Javascript

// Defining underscore contrib variable 
var _ = require('underscore-contrib');  
  
function get(g) { 
    return this[g]; 
} 
  
var geekFunc = _.functionalize(get); 
  
var zambiatek = { 
    zambiatek: "Computer Science Portal for Geeks"
}; 
console.log(geekFunc(zambiatek, "zambiatek"))

Output:

Computer Science Portal for Geeks

Example 2:

Javascript

// Defining underscore contrib variable 
var _ = require('underscore-contrib');  
  
function get(g) { 
    return this[g]; 
} 
  
var geekFunc = _.functionalize(get); 
  
var zambiatek = { 
    zambiatek: 1000000 
}; 
console.log(geekFunc(zambiatek, "zambiatek"))

Output:

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