Underscore.js _.iterators.unfold() Method

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With the help of _.iterators.unfold() method, we can get the values from iteration function where unary function is expected to return single value whenever function is invoked by using this method.

Syntax:

_.iterators.unfold( seed, unaryFn )

Return Value: It returns the value from iteration function.

Note: To execute the below examples, you have to install the underscore-contrib library by using the following command.

npm install underscore-contrib

Example 1: In this example, we can see that by using _.iterators.unfold() method, we are able to get the value from iteration function where unary function return only single value whenever function is invoked.

Javascript

// Defining underscore contrib variable  
var _ = require('underscore-contrib'); 
  
function isGFG (val) { 
    return val + " for Geeks"; 
} 
  
var geek = _.iterators.unfold("Geeks", isGFG); 
  
for(var i = 0; i < 3; i++) { 
    console.log(geek()); 
}

Output:

Geeks
Geeks for Geeks
Geeks for Geeks for Geeks

Example 2:

Javascript

// Defining underscore contrib variable  
var _ = require('underscore-contrib'); 
  
function plusFive (val) { 
    return val + 5; 
} 
  
var geek = _.iterators.unfold(1, plusFive); 
  
for(var i = 0; i < 3; i++) { 
    console.log(geek()); 
}

Output:

1
6
11

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