Slide 1

Slide 1 text

(Bonjour.)

Slide 2

Slide 2 text

Josh Abernathy @joshaber

Slide 3

Slide 3 text

No content

Slide 4

Slide 4 text

No content

Slide 5

Slide 5 text

Story time.

Slide 6

Slide 6 text

No content

Slide 7

Slide 7 text

No content

Slide 8

Slide 8 text

No content

Slide 9

Slide 9 text

Reactive Extensions (Rx)

Slide 10

Slide 10 text

Erik Meijer

Slide 11

Slide 11 text

ReactiveCocoa (RAC)

Slide 12

Slide 12 text

for a ReactiveCocoa Better World

Slide 13

Slide 13 text

PHILOSOPHY

Slide 14

Slide 14 text

Idea > Code

Slide 15

Slide 15 text

Not “easy”

Slide 16

Slide 16 text

But it’s good.

Slide 17

Slide 17 text

“A framework for composing and transforming sequences of values.”

Slide 18

Slide 18 text

“A framework for composing and transforming sequences of values.” — Scumbag Josh

Slide 19

Slide 19 text

It’s like a series of tubes...

Slide 20

Slide 20 text

“A sequence of values over time.”

Slide 21

Slide 21 text

“A sequence of values over time.” — Me, just now

Slide 22

Slide 22 text

RACSubscribable

Slide 23

Slide 23 text

RACSubscribable

Slide 24

Slide 24 text

RACSubscribable

Slide 25

Slide 25 text

RACSubscriber

Slide 26

Slide 26 text

Subscription Iteration

Slide 27

Slide 27 text

That’s it!

Slide 28

Slide 28 text

???

Slide 29

Slide 29 text

Async work

Slide 30

Slide 30 text

Network request

Slide 31

Slide 31 text

UI events

Slide 32

Slide 32 text

KVO

Slide 33

Slide 33 text

???

Slide 34

Slide 34 text

KVO property = UI events = Network request = Async work = ??? = Subscribables

Slide 35

Slide 35 text

Shared Vocabulary

Slide 36

Slide 36 text

Shared Toolset

Slide 37

Slide 37 text

Composable

Slide 38

Slide 38 text

It’s all about The Operators

Slide 39

Slide 39 text

Compose Combine Transform

Slide 40

Slide 40 text

No content

Slide 41

Slide 41 text

No content

Slide 42

Slide 42 text

PHILOSOPHY

Slide 43

Slide 43 text

No content

Slide 44

Slide 44 text

Expressive

Slide 45

Slide 45 text

Expressive (But dense.)

Slide 46

Slide 46 text

No content

Slide 47

Slide 47 text

Code Locality

Slide 48

Slide 48 text

No content

Slide 49

Slide 49 text

Less State

Slide 50

Slide 50 text

No content

Slide 51

Slide 51 text

It’s all about The Operators

Slide 52

Slide 52 text

It’s all about The Operators (There are a lot of operators.)

Slide 53

Slide 53 text

-select: Hi to all HI ALL TO

Slide 54

Slide 54 text

-where: A B A A A

Slide 55

Slide 55 text

+merge:

Slide 56

Slide 56 text

-throttle:

Slide 57

Slide 57 text

-selectMany:

Slide 58

Slide 58 text

-selectMany:

Slide 59

Slide 59 text

-selectMany: “When I get a value, subscribe to the next subscribable.”

Slide 60

Slide 60 text

-selectMany: “When I get a value, subscribe to the next subscribable.”

Slide 61

Slide 61 text

-selectMany: Look, it’s about chaining ok?

Slide 62

Slide 62 text

No content

Slide 63

Slide 63 text

-takeUntil:

Slide 64

Slide 64 text

-catch:

Slide 65

Slide 65 text

Errors? What errors?

Slide 66

Slide 66 text

-catch:

Slide 67

Slide 67 text

Where do subscribables Come from?

Slide 68

Slide 68 text

Hot vs. Cold

Slide 69

Slide 69 text

Honey badger don’t care Hot: Everyone gets the same thing

Slide 70

Slide 70 text

Honey badger most certainly does care Cold: Everyone’s separate

Slide 71

Slide 71 text

PHILOSOPHY

Slide 72

Slide 72 text

So Lazy.

Slide 73

Slide 73 text

Subscribing can have side effects

Slide 74

Slide 74 text

-retry:

Slide 75

Slide 75 text

-repeat:

Slide 76

Slide 76 text

Where do subscribables Come from? No seriously,

Slide 77

Slide 77 text

Cold: +createSubscribable:

Slide 78

Slide 78 text

No content

Slide 79

Slide 79 text

No content

Slide 80

Slide 80 text

Hot: Subjects

Slide 81

Slide 81 text

No content

Slide 82

Slide 82 text

No content

Slide 83

Slide 83 text

RACSubject

Slide 84

Slide 84 text

RACAsyncSubject RACSubject

Slide 85

Slide 85 text

RACAsyncSubject RACSubject RACReplaySubject

Slide 86

Slide 86 text

RACAsyncSubject RACSubject RACReplaySubject RACBehaviorSubject

Slide 87

Slide 87 text

No content

Slide 88

Slide 88 text

-defer: “I’ll give you a subscribable when someone subscribes.” Hot to Cold

Slide 89

Slide 89 text

-publish/-multicast: “Funnel everything through one subscription.” Hot to Cold

Slide 90

Slide 90 text

PHILOSOPHY

Slide 91

Slide 91 text

Not “easy”

Slide 92

Slide 92 text

But it’s good.

Slide 93

Slide 93 text

github.com/github/ReactiveCocoa More Info: Reactive Extensions (Rx) @joshaber

Slide 94

Slide 94 text

(Fin.)