sample async/await

async_and_await.js

// these are samples for async/await
async function rejecting() {
	throw "reject!!!!";
}
async function resolving(msg) {
	await sleep(Math.random() * 10000);
  return message = "resolve!" + (msg ? " -- " + msg : "");
}

resolving()
	.then( value => {
		console.log("==> ok");
		console.log(value);
	})
	.catch( error => {
		console.log("==> Oops!");
		console.log(error);
	});
rejecting()
	.then( value => {
		console.log("==> ok");
		console.log(value);
	})
	.catch( error => {
		console.log("==> Oops!");
		console.log(error);
	});

for (let i = 1; i < 10; i++) {
  resolving(i).then(message => console.log(message))
}

// JavaScript simple sleep function 
// usage: await sleep(milliseconds)
function sleep(milliseconds) {
  return new Promise(resolve => setTimeout(resolve, milliseconds));
}

// ==> Oops!
// reject!!!!
// resolve! -- 9
// resolve! -- 1
// resolve! -- 5
// resolve! -- 8
// resolve! -- 7
// ==> ok
// resolve!
// resolve! -- 2
// resolve! -- 3
// resolve! -- 6
// resolve! -- 4