Refactoring Asynchronous TypeScript Code

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Talk Slides at Voxxed Days Frontend, Bucharest 2019. Abstract: You send a request, then you wait for the response. And so it begins… After you get back A, you request B, then C, but only after you also receive D and the user clicks ”OK” in a modal dialog. Sounds familiar? So you know the pain! Asynchronism is probably the most difficult mental leap Single-Page Apps forced us to take, especially if you want to write clean, maintainable code. Join this live-coding session to see us refactoring TypeScript code from callback-hell to promises and then Observables, pair programming and discussing lots of best practices we established for our projects at IBM. As we go, we will intentionally avoid any framework-specific intelligence: there will be a minimal Angular7 app, but our focus will remain on paradigms and principles. And at the end, we also prepared a tiny surprise for you: a way to avoid your client/server data structures to ever go out of sync again.

Software

Refactoring
from Callback Hell
to Observables
In TypeScript + Angular Marian Stanciu
Victor Rentea

Independent
Technical Trainer & Coach
HibernateSpring Java 8
Architecture, DDDDesign Patterns
Clean Code Unit Testing, TDD
Java Performance and much more…Scala
180+ days1300 devs6 years
VictorRentea.rovictor.rentea@gmail.com
30 companies
Posting daily on

Marian Stanciu
Internal Mentor/Coach
Technical Lead
Full-Stack Developer
stanciumariansmm@gmail.com

@VictorRentea @StanciuMarianM15
JavaScript is Single Threaded
Callbacks
Background Tasks
REST calls at a SPA
+
=
Avoids race conditions
V

@VictorRentea @StanciuMarianM16
Get Current User Get All Countries
Get Cities for Country
Preselect User
Country
Get Stores for City
Init
Submit
Validate ReceiptID
Confirm Dialog
Request Coupon
Display Coupon
RESTUSERLegend:SYNC
Coupon Service
V

@VictorRentea @StanciuMarianM18
looking back

@VictorRentea @StanciuMarianM19
Controller methods should access fields directly
Prefer local variables instead of fields
Clean Code + TypeScript
Don't subscribe() in subscribe(): Extract methods instead
Learn the Array API: filter, find, map, …
ng
V

@VictorRentea @StanciuMarianM110
Promise Observable
One Async Event Stream of Async Events
Cancellable
rx$q
forkJoinPromise.all
await
UI events:
(But an HTTP request only fires ONCE)
Async
Constructs
< >
V

@VictorRentea @StanciuMarianM111
Keep your API in sync
using swagger
Use types. Never “any” or {}.
Group your fields in data structures.
Then, generate them.
We TypeScript
M

@VictorRentea @StanciuMarianM112
Swagger Generated TypeScript
…
M

@VictorRentea @StanciuMarianM113
async asyncAwait() {
// stuff1
await this.getPromiseA();
// stuff2
let b = await this.getPromiseB();
// stuff3 with b
}
callbackHell() {
// stuff1
this.getPromiseA().then(() => {
// stuff2
this.getPromiseB().then(b => {
// stuff3 with b
});
});
}
promiseChaining() {
// stuff1
this.getPromiseA().then(() => {
// stuff2
return this.getPromiseB();
}).then(b => {
// stuff3 with b
});
}
equivalent to
V

@VictorRentea @StanciuMarianM114
Questions?
Multi-Task Elegantly
on 1 Thread!
Trainings: VictorRentea.ro / victor.rentea@gmail.com
Posting daily on:Join us!
@IBM

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ManageIQ - Sprint 236 Review - Slide Deck

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Refactoring Asynchronous TypeScript Code

1. Refactoring from Callback Hell to Observables In TypeScript + Angular Marian Stanciu Victor Rentea

2. Victor Rentea Clean Code Evangelist VictorRentea.ro 30+ talks, 10+ meetups Lead Architect at Software Craftsman XP: Pair Programming, Clean Code, TDD Java Champion Founder of:

3. Independent Technical Trainer & Coach HibernateSpring Java 8 Architecture, DDDDesign Patterns Clean Code Unit Testing, TDD Java Performance and much more…Scala 180+ days1300 devs6 years VictorRentea.rovictor.rentea@gmail.com 30 companies Posting daily on

4. Marian Stanciu Internal Mentor/Coach Technical Lead Full-Stack Developer stanciumariansmm@gmail.com

5. @VictorRentea @StanciuMarianM15 JavaScript is Single Threaded Callbacks Background Tasks REST calls at a SPA + = Avoids race conditions V

6. @VictorRentea @StanciuMarianM16 Get Current User Get All Countries Get Cities for Country Preselect User Country Get Stores for City Init Submit Validate ReceiptID Confirm Dialog Request Coupon Display Coupon RESTUSERLegend:SYNC Coupon Service V

7. 7

8. @VictorRentea @StanciuMarianM18 looking back

9. @VictorRentea @StanciuMarianM19 Controller methods should access fields directly Prefer local variables instead of fields Clean Code + TypeScript Don't subscribe() in subscribe(): Extract methods instead Learn the Array API: filter, find, map, … ng V

10. @VictorRentea @StanciuMarianM110 Promise Observable One Async Event Stream of Async Events Cancellable rx$q forkJoinPromise.all await UI events: (But an HTTP request only fires ONCE) Async Constructs < > V

11. @VictorRentea @StanciuMarianM111 Keep your API in sync using swagger Use types. Never “any” or {}. Group your fields in data structures. Then, generate them. We TypeScript M

12. @VictorRentea @StanciuMarianM112 Swagger Generated TypeScript … M

13. @VictorRentea @StanciuMarianM113 async asyncAwait() { // stuff1 await this.getPromiseA(); // stuff2 let b = await this.getPromiseB(); // stuff3 with b } callbackHell() { // stuff1 this.getPromiseA().then(() => { // stuff2 this.getPromiseB().then(b => { // stuff3 with b }); }); } promiseChaining() { // stuff1 this.getPromiseA().then(() => { // stuff2 return this.getPromiseB(); }).then(b => { // stuff3 with b }); } equivalent to V

14. @VictorRentea @StanciuMarianM114 Questions? Multi-Task Elegantly on 1 Thread! Trainings: VictorRentea.ro / victor.rentea@gmail.com Posting daily on:Join us! @IBM

Refactoring Asynchronous TypeScript Code

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