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syncing async kyle simpson @getify http://getify.me

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vs. parallel async

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threads

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event-loop concurrency

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1 2 3 4 1 2 3

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1 2 3 4 1 2 3 done! done!

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async patterns

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callbacks == continuations

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callbacks got problems 2 major ^

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“callback hell”

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still “callback hell”

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inversion of control

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trust: 1. not too early 2. not too late 3. not too many times 4. not too few times 5. no lost context 6. no swallowed errors ...

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nested callbacks are not reasonable

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we write

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we think

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js thinks

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sync-looking async synchronous sequential blocking

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hell is callbacks -Sartre

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promise: future value

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promise: “completion” event

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promises: 1. only resolved once 2. either success OR error 3. messages passed/kept 4. exceptions become errors 5. immutable once resolved

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uninversion of control

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steps

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promise: flow control

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scenario: load files in parallel, render in order, but ASAP

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cool story, bro. but...

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scenario: timeout of a promise

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blog.getify.com/promises-part-1/ github.com/getify/native-promise-only

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promise abstractions

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sequence = series of automatically chained promises

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github.com/getify/asynquence async + sequence = asynquence

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remember? load files in parallel, render in order, but ASAP

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promises without all the fuss

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gimme moar sync

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ES6 generators davidwalsh.name/es6-generators

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generator + promises yield promises

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ES2016 async ? github.com/lukehoban/ecmascript-asyncawait

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github.com/getify/a-tale-of-three-lists

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“if you like it then you shoulda put async in it...”

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thx! kyle simpson @getify http://getify.me