Lodash _.extend() Method

The _.extend() method is like the _.assign() method except that it iterates over its own and inherited source properties. 

Syntax:

_.extend(object, sources)

Parameters: This method accepts two parameters as mentioned above and described below:

• object: This parameter holds the destination object.
• sources: This parameter holds the source objects.

Return Value: This method returns an object.

Example 1:

Javascript

// Defining Lodash variable
const _ = require('lodash');

function Gfg() {
this.a = 5;
}

function GFG() {
this.c = 10;
}

Gfg.prototype.b = 15;
GFG.prototype.d = 20;

// Calling _.extend() methjod
console.log(_.extend( { a: 4 },
    new Gfg, new GFG));

Output:

{ a: 5, b: 15, c: 10, d: 20 }

Example 2:

Javascript

// Defining Lodash variable
const _ = require('lodash');

function Gfg() {
this.a = 5;
}

function GFG() {
this.c = 10;
}

// Calling _.extend() method
console.log(_.extend( { a: 4 },
    new Gfg, new GFG));

Output:

{ a: 5, c: 10 }

Note: This will not work in normal JavaScript because it requires the lodash library to be installed.