Javascript Promise

	// promise.js
	function countdown(seconds) {
	return new Promise(function(resolve, reject) {
	for(let i=seconds; i>=0; i--) {
	setTimeout(function() {
	if(i>0) console.log(i + '...');
	else resolve(console.log("GO!"));
	}, (seconds-i)*1000);
	}
	});
	}
	countdown(5).then(
	function() {
	console.log("countdown completed successfully");
	},
	function(err) {
	console.log("countdown experienced an error: " + err.message);
	}
	);
	/*
	const p = countdown(5);
	p.then(function() {
	console.log("countdown completed successfully");
	});
	p.catch(function(err) {
	console.log("countdown experienced an error: " + err.message);
	});
	*/

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