Promise Example

promise-example.js

// Simulate a network request by using setTimeout
// This achieves the same thing as our version above.
// This time though, we are going to return a Promise!
function fakeNetworkCall(url) {
	const promise = new Promise((resolve, reject) => {
		setTimeout(() => resolve(url), 1500);	
	});
	
	return promise;
}

// Make the first call
fakeNetworkCall('/api/endpoint/1/')
// We can call 'then' on the promise that is returned by our function
// This allows us to handle the response eventually returned by the fulfilled promise.
.then(result => {
	console.log(result);
	return fakeNetworkCall('/api/endpoint/2/');
})
// We returned another promise
// so I can just make the other call like this!
.then(result => {
	console.log(result);
	return fakeNetworkCall('/api/endpoint/3/');
})
// And here we go with the third call.
// Phew - no need to indent!
.then(result => {
	console.log(result);
})
// Handle any errors!
.catch(error => {
	console.log("Error!");
	console.log(error); 
});