Today we talk about asynchronous operations in 'Promises', in addition to async and await.

A JavaScript Promise object be in one of four states:

• Pending - While a Promise object is "pending" (working), the result is undefined.
• Fulfilled - When a Promise object is "fulfilled", the result is a value.
• Rejected - When a Promise object is "rejected", the result is an error object.
• Settled - While a Promise object has been "settled", the result is a value or error object.

The Promise object supports two properties: state and result.

The keyword await before a function makes the function wait for a promise, while the keyword async before a function makes the function return a promise. The async and await make promises easier to write.

References:

• Andrew's Blog Article on Promises
• Another article for Promises
• Async and Await

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