Answer 1

Code Barak

let book = {
_year: 2004,
edition: 1,
set year(value) {
this.edition = value-this._year
this._year = value
},
get year() {
return this._year
}
}

book.year = 2006
console.log(book.edition) // 2
console.log(book.year) // 2006

https://code.sololearn.com/WzHa34i0oOEE/?ref=app