CODEWITHSUNDEEP
javascript
Yar Sol
Yar Sol

Reputation: 197

Why do object rewrite another frozen object

I can't understand why my object overwrite another frozen object, i try to create a new instance from my previous object and then freeze it. But anyways, it's overwrites itself even if it's frozen
Also, why i can change my check object if it's const
JS is actaully weird

I have the code below 

let obj = {check: "check"};  
const check = Object.create(obj);
Object.freeze(check);
obj["second"] = "something";
// Expected result: obj = {check: "check", second: "something"}
// check = {check: "check"}

// Actual result: obj = {check: "check", second: "something"}
// check = {check: "check", second: "something"}

Upvotes: 0

Views: 70

Answers (2)

DEVCNN
DEVCNN

Reputation: 622

The Object.create() method creates a new object, using an existing object as the prototype of the newly created object. The properties of the prototype are accessible to the child objects.

Source : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/create

You have to use Object.assign() if you want to clone an object.

Upvotes: 0

Maheer Ali
Maheer Ali

Reputation: 36574

Object.create() doesnot clone the object you should use Object.assign

let obj = {check: "check"};  
const check = Object.create(obj);
Object.seal(check);
obj["second"] = "something";
console.log(check)

Upvotes: 2

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