Opposite of Object.freeze or Object.seal in JavaScript

Question

What is the opposite of Object.freeze or Object.seal? Is there a function that has a name such as detach?

Answer 1

You can unfreeze an array by using spread operator.

//let suppose arr is a frozen array i.e. immutable
var arr = [1, 2, 3];

//if arr is frozen arr you cannot mutate any array referring to it
var temp = arr;

temp.push(4);  //throws an error "Cannot modify frozen array elements"

//here mutableArr gets the elements of arr but not reference to it
//hence you can mutate the mutableArr

var mutableArr = [...arr];

mutableArr.push(4);  //executes successfully