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Angular & RXJS: examples and use cases
1.
ANGULAR&RXJS FABIOBIONDI.io SEP2018
2.
fabiobiondi.io TRAINING AND MENTORING
3.
ANGULAR JAVASCRIPT REACT OPPORTUNITÀ
per DEVELOPER ITALIANI (jobs / collaborations / training and more) FACEBOOK GROUPS developer italianideveloper italianideveloper italiani
4.
RXJS-6-INTRO
5.
interval(value) returns an observable
sequence that produces a value after each period.
6.
map(fn) transform the items
emitted by an Observable by applying a function to each item
7.
<fb-clock>
8.
ANGULAR & RXJS
9.
You don't need
subscribe(fn)
10.
{{myObs$ | async}} the
async Angular pipe “I” automatically subscribes an observer
11.
<fb-clock>
12.
WHERE CAN YOU
USE RXJS IN ANGULAR? ALMOST EVERYWHERE! In components, directives, pipes, services, XHR, router, guards, interceptors ...
13.
ASync Pipes {{'Milano' |
temperature | async }} // output: 20°
14.
Router EVENTS
15.
FILTER Router EVENTS
16.
Reactive FORMSTemplate-driven FORMS
17.
RxJS operators used
in forms
18.
Create Component at
Runtime
19.
HttpClient
20.
HttpClient & map(fn) Leanne
Graham (Sincere@april.biz) Transform HTTP response
21.
forkJoin(array) Combine Multiple HTTP
requests When all observables complete, emit the last emitted value from each.
22.
switchMap Map to observable,
complete previous inner observable, emit values.
23.
! NESTED XHR with
switchMap(fn) Solution Sequential HTTP requests
24.
exhaustMap(array) Abort new HTTP
requests until the previous one has been completed
25.
Services UserService: fetch data
View: request and use data
26.
perform actions or
side-effects, such as logging. tap(fn) “Debug” and side effects with tap()
27.
AUTHENTICATION
28.
A value that
changes over time BehaviorSubject Store authentication token
29.
UI: SignInComponent SignIn by
using LoginService
30.
LoginService Invoke login REST
Service and save token
31.
SECURITY
32.
*ifLogged Structural Directive Render
DOM if user is logged Usage
33.
AuthGuard Disable route access
if user is not logged Usage
34.
HTTP Interceptors Inject token
to each XHR and handle errors
35.
NGRX (Redux)
36.
NGRX Store ! Too
many subscriptions
37.
*ngIf…as Only one subscription
38.
NGRX Effects
39.
DATA MANIPULATION
40.
7: telly.hoeger@billy.biz 8: sherwood@rosamond.me 9:
chaim_mcdermott@dana.io 10: rey.padberg@karina.bizt FILTER ARRAY with map: easiest way Get user ID > 6 and email lowercase
41.
X FILTER ARRAY WITH
RXJS (1/3) Wrong Way
42.
FILTER ARRAY WITH
RXJS (2/3): flatten in single emissions Get user ID > 6 ! Too many. I just need one!
43.
we only need
to emit one value (3/3) Get user ID > 6 and email lowercase
44.
scan & reduce
45.
scan(fn) applies an accumulator
function over an observable sequence and returns each intermediate result
46.
reduce(fn) apply a function
to each item emitted by an Observable, sequentially, and emit the final value
47.
scan ! Too many. I
just need one! Display the total of likes Given an array Display the total of likes
48.
scan Display the total
of likes Given an array Display the total of likes Yo! :)
49.
REAL-WORLD-EXAMPLES with scan(fn)
50.
<Clock> Picker
51.
52.
<ImageGallery> A simple carousel
with timer and NEXT / PREV buttons
53.
! !
54.
<ImageGallery> Enhanced version: get
Token, HTTP requests and completely “pure”
55.
56.
ANGULAR JAVASCRIPT REACT OPPORTUNITÀ
per DEVELOPER ITALIANI (jobs / collaborations / training and more) FACEBOOK GROUPS developer italianideveloper italianideveloper italiani
57.
fabiobiondi.io