[рони]

crabkilla,

var book = {
  title: "The Adventures of Sherlock Holmes",
  author: "Arthur Conan Doyle",
  year: 1892,
  pages: 307
}
delete book['pages'];
book.genre = "“detective fiction short stories”";
var proplist = '';
for (var prop in book) {
    proplist += prop + " = " + book[prop] + "\n";
}
console.log(proplist);