iteration from 'Learning Javascript'

	// it.js
	class Log {
	constructor() {
	this.messages = [];
	}
	add(message) {
	this.messages.push({ message, timestamp: Date.now() });
	}
	// create iterator
	[Symbol.iterator]() {
	let i = 0;
	const messages = this.messages;
	return {
	next() {
	if (i >= messages.length)
	return { value: undefined, done: true };
	return { value: messages[i++], done: false };
	}
	}
	}
	}
	let log = new Log();
	log.add('first log');
	log.add('second log');
	log.add('third log');
	for (let entry of log) {
	console.log(`${entry.message} @ ${entry.timestamp}`);
	}

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