ES6 012 – Rest pattern …

let options = {
title: "Menu",
height: 200,
width: 100
};
// title = property named title
// rest = object with the rest of properties
let {title, ...rest} = options;
// now title="Menu", rest={height: 200, width: 100}
alert(rest.height);  // 200
alert(rest.width);   // 100

let [name1, name2, ...rest] = ["Julius", "Caesar", "Consul", "of the Roman Republic"];
alert(name1); // Julius
alert(name2); // Caesar
// Note that type of `rest` is Array.
alert(rest[0]); // Consul
alert(rest[1]); // of the Roman Republic
alert(rest.length); // 2