Concise enums via ES6 destructuring

enums.js

function enumeration() {
	const out = [];
	for (let ix = 0; ix < arguments.length; ++ix) {
		let val = {};
		Object.defineProperty(val, 'name', {
			value: arguments[ix],
			writable: false,
			configurable: false
		});
		out.push(val);
	}
	return out;
}

const [UNKNOWN, READY, RUNNING] = enumeration('UNKNOWN', 'READY', 'RUNNING');
let state = UNKNOWN;