Deep vs Shallow cloning 2

_Khojiakbar_ - Jun 17 -

- Dev Community

OBJECT

Name: Deep vs Shallow cloning 2
Rating: 2.2 (8184 reviews)
Author: __khojiakbar__

const original = {
    name: 'John',
    age: 23,
    address: {
        city: 'Tashkent',
        state: 'Oqqorg\'on',
    }
}

SPREAD:

// Spread => Shallow copying
let copiedObj = {...original}
copiedObj.name = 'Alice'
copiedObj.address.city = 'Samarkand';

console.log(copiedObj.name)
console.log(original.name)

console.log(original.address.city)
console.log(copiedObj.address.city)

// Alice
// John
// Samarkand
// Samarkand

Equal(=):

// = / very shallow copying it is even copying non-nested properties
let copiedObj = original;
copiedObj.name = 'Alice'
copiedObj.address.city = 'Samarkand'

console.log(original.name)
console.log(copiedObj.name)
console.log(original.address.city)
console.log(copiedObj.address.city)

// Alice
// Alice
// Samarkand
// Samarkand

Object.assign():

// Object.assign() => Shallow copy
let copiedObj = Object.assign({}, original)
copiedObj.name = 'Alice';
copiedObj.address.city = 'Samarkand'
console.log(original.name)
console.log(copiedObj.name)
console.log(original.address.city)
console.log(copiedObj.address.city)

// John
// Alice
// Samarkand
// Samarkand

JSON:

// JSON => Deep copy
let copiedObj = JSON.parse(JSON.stringify(original))
copiedObj.name = 'Alice'
copiedObj.address.city = 'Samarkand'

console.log(original.name)
console.log(copiedObj.name)
console.log(original.address.city)
console.log(copiedObj.address.city)

// John
// Alice
// Tashkent
// Samarkand