The async and await keywords in JS that lets us make the functions asynchronous and enable asynchronous, promise-based behavior to be written in a cleaner style .
what does the async keyword do:
If we add Async keyword before any function then that functions becomes asynchronous function and
it returns a Promise .
what does the await keyword do:
talking in terms of output that we see -> blocks the code execution untill the await expession gets resolved i.e ==> returning promise is settled==>now next line would be executed only when await line will get it's promise resolved.
talking in terms of how code works behind the hood : so async and await never blocks code execution but instead they wrap all code in async function inside big Promise and then the then() method would be called asynchronously.
Await expressions make promise-returning functions behave as though they're synchronous by suspending execution until the returned promise is fulfilled or rejected.
The resolved value of the promise is treated as the return value of the await expression.
Error handling in Async Await-
we use normal Try catch block instead of then().catch() chain.
the flow in try catch would be if one of the promise gets rejected then thr succeeding try would be skipped and code in catch block will be executed.
