The Lodash _.defaults() Method assign properties of source objects to the destination object for all destination properties that resolve to undefined. Source objects are applied from left to right. Once a property is set, additional values of the same property are ignored. This method mutates the object.
Syntax:
_.defaults( 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:
// Defining Lodash variable const _ = require('lodash'); a = _.defaults({ 'a': 3 }, { 'b': 1 }, { 'c': 5 }, { 'd': 5 }, { 'e': 5 }); console.log(a); |
Output:
{ gfg: 3, geek: 1 }
Example 2:
// Defining Lodash variable const _ = require('lodash'); a = _.defaults({ 'a': 'first setting'}, { 'a': 'second setting but doesn't changes'}); console.log(a); |
Output:
{ a: 3, b: 1, c: 5, d: 5, e: 5 }
Example 3:
Output:
{ a: 'first setting' }
Note: This will not work in normal JavaScript because it requires the lodash library to be installed and can be installed using the following command:
npm install lodash
.
