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

there's an easy way to change object property without mutating the original object.

const a = {x: "Hi", y: "Test"};
const b = {...a, y: "hello"};