If I write the following code:
var foo = [1, 2, 3, 4];
var bar = foo;
Object.freeze(bar);
Does this mean foo is also immutable?
If not, how can bar remain constant if foo is updated?
Asked
Active
Viewed 33 times
0
-
There is no object in your code (and all primitive values are immutable, yes). And if you did something like `foo = {}`, then there would be only one object (not a second "`bar` one"). – Bergi Aug 21 '17 at 03:06
-
1note: *The object being frozen is immutable. However, it is not necessarily constant. The second example shows that a frozen object is not constant (freeze is shallow).* - https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze#Examples – Jaromanda X Aug 21 '17 at 03:08
-
@Bergi modified code to make my point more clear – Fitzy Aug 21 '17 at 03:10
-
@Fitzy Thanks. But yes, `Object.freeze` works on the (one!) *object* passed to it, not on the variable. – Bergi Aug 21 '17 at 03:11
-
Btw, you should be able to simply try this out. – Bergi Aug 21 '17 at 03:12
-
@Bergi I guess my question, as written in the update, is how could i change the value of `foo` without changing the value of `bar` as well? – Fitzy Aug 21 '17 at 03:14
-
@Fitzy Ah ok, that's what you wanted to know. See the third duplicate link for that :-) – Bergi Aug 21 '17 at 03:19
-
@Bergi Sure enough, it worked. Should've been more clear. Thanks :) – Fitzy Aug 21 '17 at 03:24