best way to clone an object in javascript
var student = {name: "Rahul", age: "16", hobby: "football"};
//using ES6
var studentCopy1 = Object.assign({}, student);
//using spread syntax
var studentCopy2 = {...student};
//Fast cloning with data loss
var studentCopy3 = JSON.parse(JSON.stringify(student));
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3.25
4
const person = {
firstName: 'John',
lastName: 'Doe'
};
// using spread ...
let p1 = {
...person
};
// using Object.assign() method
let p2 = Object.assign({}, person);
// using JSON
let p3 = JSON.parse(JSON.stringify(person));
Thank you!
4
0
4.25
4
var x = {myProp: "value"};
var xClone = Object.assign({}, x);
//Obs: nested objects are still copied as reference.
Thank you!
4
0
4.5
6
var x = {myProp: "value"};
var y = Object.assign({}, x);
Thank you!
6
0
3.5
4
var x = {key: 'value'}
var y = JSON.parse(JSON.stringify(x))
//this method actually creates a reference-free version of the object, unlike the other methods
//If you do not use Dates, functions, undefined, regExp or Infinity within your object
Thank you!
4
0
0
12
// syntax: let <newObjectName> = {...<initialObjectName>};
// example:
const me = {
name: 'Jakes',
age: 30,
};
const friend = {...me};
friend.age = 27;
console.log(friend.age); // 27
console.log(me.age); // 30
// -----------------------------
// BAD
// -----------------------------
const me = {
name: 'Jonas',
age: 30,
};
const friend = me;
friend.age = 27;
console.log(friend.age); // 27
console.log(me.age); // 30
Thank you!
12
0
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