Underscore.JS - chain method

Syntax

_.chain(object)

chain method returns a wrapped object and when methods are invoked on this object, each method return the wrapped object until value method is called. See the below example:

Example

var _ = require('underscore');

var students = [{name: 'Sam', age: 10},{name: 'Joe', age: 8},{name: 'Rob', age: 12}]

//Get the highest aged student using chain method
var eldest = _.chain(students)
   .sortBy(function(student){return student.age;})
   .map(function(student){return "Name: " + student.name + ", age: " + student.age;})
   .last()
   .value();

console.log(eldest);

Save the above program in tester.js. Run the following command to execute this program.

Command

\>node tester.js

Output

Name: Rob, age: 12