Javascript asynchronous

Callback (or continuation) ... so call me maybe :)

continuation passing style

Callback HELLLLL

Callbacks - Two Problems

A lose of control ( Inversion of Control ? can I trust you ? )

Hard to reason about ( its a time loooooooop and the temporal dependency)

A thunk is a function that has everything already that it needs to do (clojure state), to give you some value back; you simply call it, give it a callback and it will give you your value back;

Thunks ? what are you smoking

Promise land!

Promises ... i owe you

future values

Completion event or error event...

i fix the inversion of control problem

Promises ... i owe you

Still callbacks ????

Promise Trust:

only resolved once

either success or error

messages passed/kept

exceptions become errors

immutable once resolved

can't be canceld

Generators (yield) Wu shu

Ruuuuuuun to complition

Generators (yield) what are you ?

It's a state machine oO

I fix the non local, non sequential reasonability problem!

a function will run till completion ! or will they ?

should I stay or should I go ...

Generators (yield) what are you ?

a generator invocation will return a iterator

Iterators

Generators (yield) what are you ?

i can use yield to return a message

and yes we can use the it.next to pass in a value :)

Generators (yield)

we still have a ... aa ... inversion of control here :(( why youuuuu

ok ok chill, so we have promises to resolve the inversion of control so put that with generators and you get ....

a generator that yields promises ...

Generators (yield)

so we yield out promises and the promise will resume the generator ... sounds easy

Generators (yield) - i love using apply

Coroutines are a programming concept that allows functions to pause themselves and give control to another function. The functions pass control back and forth.

Coroutines

Generators (yield) what are you ?

synchronous looking asynchronous code

Coroutines - getting back the controle

Does this look familiar ?

Coroutines - getting back the controle

Does this look familiar ?

Async functions!

Async functions

Rxjs

js-csp