How to deep copy in JavaScript
There are multiple ways to deep copy an object in JavaScript. In this shot, we will discuss two ways:
- Using the lodash
deepClonemethod - Using
JSON.parseandJSON.stringifymethods
lodash deepClone
When you deep copy an object in JavaScript, your best bet is to use an existing method from a library. The deepClone method in
lodash can be used to easily deep clone an object.
import _ from 'lodash';var original = [{ 'a': 1 }, { 'b': 2 }];var copy = _.cloneDeep(original);console.log(copy)console.log(copy[0] === original[0]); // false as different objects now
JSON.parse and JSON.stringify
If your object is not too complex, you can use the JSON.parse and JSON.stringify methods to make a deep copy.
This method will not work if the object consists of Dates, functions, undefined, Infinity, RegExps, Maps, Sets, Blobs, FileLists, ImageDatas, sparse Arrays, Typed Arrays, or other complex types.
var original = [{ 'a': 1 }, { 'b': 2 }];var copy = JSON.parse(JSON.stringify(original));console.log(copy)console.log(copy[0] === original[0]); // false as different objects now
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