Slide 1

Slide 1 text

The whole future
 declared in a var @andrestaltz

Slide 2

Slide 2 text

var a = 3; var b = 10 * a; console.log(b); // 30 a = 4; console.log(b); // 30 b = 10 * a; console.log(b); // 40

Slide 3

Slide 3 text

var a = 3; var b = 10 * a; console.log(b); // 30 a = 4; console.log(b); // 30 b = 10 * a; console.log(b); // 40

Slide 4

Slide 4 text

var a = 3; var b = 10 * a; console.log(b); // 30 a = 4; console.log(b); // 30 b = 10 * a; console.log(b); // 40

Slide 5

Slide 5 text

var a = 3; var b = 10 * a; console.log(b); // 30 a = 4; console.log(b); // 30 b = 10 * a; console.log(b); // 40

Slide 6

Slide 6 text

No content

Slide 7

Slide 7 text

var a = 3; var b = 10 * a; console.log(b); // 30 a = 4; b = 10 * a; console.log(b); // 40
 a = 6; b = 10 * a;
 console.log(b); // 60

Slide 8

Slide 8 text

b 30 40 30

Slide 9

Slide 9 text

b 30 40 40

Slide 10

Slide 10 text

b 30 40 60

Slide 11

Slide 11 text

time

Slide 12

Slide 12 text

3 4 6 a

Slide 13

Slide 13 text

3 4 6 a a = 3; a = 4; a = 6; b = 10 * a; b = 10 * a; b = 10 * a;

Slide 14

Slide 14 text

b = 10 * a; b = 10 * a; b = 10 * a; updateB(a);
 updateB(a);
 updateB(a);

Slide 15

Slide 15 text

3 4 6 a Inconsistent Mutable
 State

Slide 16

Slide 16 text

Inconsistent undefined 30 40 60 State

Slide 17

Slide 17 text

undefined 30 40 60 30 60 40 Events State

Slide 18

Slide 18 text

undefined 30 40 60 30 60 40 b$ State Events

Slide 19

Slide 19 text

25 27 26 24 25 26 27 24 Age Birthdays

Slide 20

Slide 20 text

3 6 4 a$ 30 60 40 b$

Slide 21

Slide 21 text

map(a => 10 * a)

Slide 22

Slide 22 text

map(a => 10 * a) [3, 4, 6]_ [30, 40, 60]_

Slide 23

Slide 23 text

map(a => 10 * a)

Slide 24

Slide 24 text

a _ a$

Slide 25

Slide 25 text


 var a$ = Observable.of(3, 4);
 var b$ = a$.map(a => 10 * a);
 
 b$.subscribe(b => {
 console.log(b);
 });
 // 30
 // 40


Slide 26

Slide 26 text


 var a$ = Observable.of(3, 4);
 var b$ = a$.map(a => 10 * a);
 
 b$.subscribe(b => {
 console.log(b);
 });
 // 30
 // 40


Slide 27

Slide 27 text


 var a$ = Observable.of(3, 4);
 var b$ = a$.map(a => 10 * a);
 
 b$.subscribe(b => {
 console.log(b);
 });
 // 30
 // 40


Slide 28

Slide 28 text


 var a$ = Observable.of(3, 4);
 var b$ = a$.map(a => 10 * a);
 
 b$.subscribe(b => {
 console.log(b);
 });
 // 30
 // 40


Slide 29

Slide 29 text


 
 var b$ = a$.map(a => 10 * a);
 
 
 
 
 
 
 All future values 
 specified in the
 declaration

Slide 30

Slide 30 text


 
 var b$ = a$.map(a => 10 * a);
 
 b$.set(60);
 
 
 
 


Slide 31

Slide 31 text


 var a$ = Observable.of(3, 4);
 var b$ = a$.map(a => 10 * a);
 a$.set(6);
 b$.subscribe(b => {
 console.log(b);
 });
 // 30
 // 40


Slide 32

Slide 32 text


 var a$ = Observable.of(3, 4, 6);
 var b$ = a$.map(a => 10 * a);
 
 b$.subscribe(b => {
 console.log(b);
 });
 // 30
 // 40
 // 60

Slide 33

Slide 33 text


 var a$ = Observable.of(3, 4, 6);
 var b$ = a$.map(a => 10 * a);
 
 
 
 
 
 
 var click$ = Observable
 .fromEvent(document, ‘click’);
 
 
 
 
 
 


Slide 34

Slide 34 text


 var click$ = Observable
 .fromEvent(document, ‘click’);
 var a$ = click$
 .scan((acc, ev) => acc + 1, 0);
 var b$ = a$.map(a => 10 * a);
 
 
 


Slide 35

Slide 35 text


 var click$ = Observable
 .fromEvent(document, ‘click’);
 var a$ = click$
 .scan((acc, ev) => acc + 1, 0);
 var b$ = a$.map(a => 10 * a);
 
 
 


Slide 36

Slide 36 text


 var click$ = Observable
 .fromEvent(document, ‘click’);
 var a$ = click$
 .scan((acc, ev) => acc + 1, 0);
 var b$ = a$.map(a => 10 * a);
 
 
 
 RxJS

Slide 37

Slide 37 text

map(a => 10 * a) 3 6 4 30 60 40

Slide 38

Slide 38 text

scan((acc, ev) => acc + ev, 0) 3 6 4 3 13 7

Slide 39

Slide 39 text

filter(a => a % 2 === 0) 3 6 4 6 4

Slide 40

Slide 40 text

3 6 4 6 4 3 delay

Slide 41

Slide 41 text

3 6 4 6 4 1 5 1 3 5 merge

Slide 42

Slide 42 text

A C B C2 B1 1 2 A1 B2 combineLatest

Slide 43

Slide 43 text

buffer catch combineLatest concat count debounce defaultIfEmpty delay distinctUntilChanged do elementAt every expand filter find first flatMap groupBy ignoreElements isEmpty last map max merge min multicast observeOn partition publish reduce refCount repeat retry sample scan share single skip skipUntil skipWhile startWith switch take takeUntil takeWhile throttle timeout window withLatestFrom zip

Slide 44

Slide 44 text

No content

Slide 45

Slide 45 text

No content

Slide 46

Slide 46 text

Reactive
 Programming Automatic updates

Slide 47

Slide 47 text

Separation of concerns

Slide 48

Slide 48 text

function andreStaltz() { showSlide1(); showSlide2(); showSlide3(); // ... showLastSlide(); for (var i = 0; i < audience.length; i++) { audience[i].goGetCoffee(); }
 }

Slide 49

Slide 49 text

var participant1 = {
 caffeineLevel: 0.05, 
 goGetCoffee: function () {
 // ... }
 }

Slide 50

Slide 50 text

Speaker Participant Participant Participant goGetCoffee()

Slide 51

Slide 51 text

Speaker Participant Participant Participant goDoSomething()

Slide 52

Slide 52 text

Speaker Participant Participant Participant goDoSomething()

Slide 53

Slide 53 text

Speaker Participant Participant Participant goDoSomething()

Slide 54

Slide 54 text

Speaker Participant Participant Participant

Slide 55

Slide 55 text

var andreStaltz = { slide$: Observable.concat(
 slide1, slide2, slide3, // ... )
 };

Slide 56

Slide 56 text

var andreStaltz = { slide$: Observable.concat(
 slide1, slide2, slide3, // ... )
 }; slide$

Slide 57

Slide 57 text

var participant1 = {
 caffeineLevel$: speaker.slide$.last()
 .flatMap(() => this.goGetCoffee())
 .scan(accumulationFormula, 0) };

Slide 58

Slide 58 text

The whole future
 declared in a var
 


Slide 59

Slide 59 text

speaker.slide$.last()