Lodash _.assignIn() Method

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The Lodash _.assignIn() Method is like the _.assign() method except that it iterates over its own and inherited source properties. Subsequent source objects overwrite property assignments of previous sources. This method mutates the object.

Syntax:

_.assignIn( dest_object, [src_obj])

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

dest_object: This is the destination object.
src_obj: These are the source objects.

Return Value: This method returns an object.

Example 1:

Javascript

// Defining Lodash variable  
const _ = require('lodash');  
  
function Gfg1() { 
  this.a = 1; 
} 
   
function Gfg2() { 
  this.c = 3; 
} 
   
Gfg1.prototype.b = 10; 
Gfg2.prototype.d = 40; 
   
console.log(_.assignIn( { a: 4 },  
    new Gfg1, new Gfg2)); 

Output:

{ a: 1, b: 10, c: 3, d: 40 }

Example 2:

Javascript

// Defining Lodash variable  
const _ = require('lodash');  
  
function Gfg1() { 
  this.a = 1; 
} 
   
function Gfg2() { 
  this.c = 3; 
} 
   
console.log(_.assignIn( { a: 4 },  
    new Gfg1, new Gfg2)); 