ASYNC / AWAIT
works with Promises
first implementation: MultiLisp (~ 1980)
promise
eventual
delay
deferred
(future)
write asynchronous code
in synchronous fashion
why asynchronous?
because you don't want your
page to be blocked by an XHR
which just shows the current weather
YES, but we need to deal with it.
Can asynchronous code cause errors?
in the beginning, there where callbacks
then they became promises
which can easily be used with async & await
can I use async & await?
should I use async & await?
+ easier to think synchronously
+ easier with a low indentation level
+ no endless then chains
+ easier debugging
+ synchronous error handling (try/catch)
- need to learn a new syntax
- async/await from start to finish
- transpile overhead when supporting IE11