ES6 – Object Literal Shorthand

let type = 'quartz';
let color = 'rose';
let carat = 21.29;
const gemstone = {
type: type,
color: color,
carat: carat
};

Object {type: "quartz", color: "rose", carat: 21.29}

Another way is

const gemstone = {  type,  color,  carat}

Also it could include a function

const gemstone = {
type,  color,  carat,
calculateWorth: function() {
// will calculate worth of gemstone based on type, color, and carat
}
};

Even shorter…

let gemstone = {
type,
color,
carat,
calculateWorth() { ... }
};