How to change a property on an object without mutating it?

Question

const a = {x: "Hi", y: "Test"}
const b = ???
// b = {x: "Bye", y: "Test"}
// a = {x: "Hi", y: "Test"}
         


        

Answer 1

Try this : const b = a.map(item => Object.assign({}, ...item)); This will create a new object without any reference to the old object a

In case if you want to do this for an array try the same with []

const b = a.map(item => Object.assign([], ...item));