Lodash _.extend() Method

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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));