Underscore.JS - extend method

Syntax

_.extend(destination, *sources)

extend method shallow copies the properties of sources passed to destination object. See the below example −

Example

var _ = require('underscore');

var name = { name : 'Sam'};
var age = {age : 30 };
var id = { id : 1 };

var student = {};

// Example 1: use extend to copy name and age to student
_.extend(student, name, age);
console.log(student);

// Example 2: add id property to student
_.extend(student, id);
console.log(student);

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

Command

\>node tester.js

Output

{ name: 'Sam', age: 30 }
{ name: 'Sam', age: 30, id: 1 }