Refactoring Asynchronous TypeScript Code

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The document discusses the transition from callback hell to observables in TypeScript and Angular, emphasizing clean coding practices and effective use of asynchronous programming. It highlights the importance of structuring APIs, utilizing RxJS observables, and employing best practices for error handling and code organization. The author, Victor Rentea, shares insights on maintaining code simplicity and efficiency while managing asynchronous operations.

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

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:

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 @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

Victor Rentea's presentation discusses the importance of simple design rules in programming, emphasizing principles such as revealing intention, avoiding duplication, and minimizing elements. He cautions against the use of partial mocks in testing, arguing for the separation of concerns to create cleaner, more maintainable code. The talk promotes practices like Test-Driven Development (TDD) and expressive coding as essential for efficient software development.

Clean Lambdas at JBCNConf by Victor RenteaVictor Rentea

This document discusses clean code practices for using lambdas in Java. It recommends encapsulating predicates and filter logic in local variables and helper methods to make code more readable and expressive. It also promotes techniques like pair programming and code reviews to help apply these principles to legacy code. Additional resources include a screencast of a workshop on clean lambdas and the presenter's tweets.

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The document discusses clean code principles such as naming conventions, small functions, avoiding nulls and side effects, and using classes as containers for logic. It also emphasizes writing code for readability through techniques like extracting methods, renaming variables for clarity, and using comments to explain intentions rather than restate code. The presenter advocates for clean code as a way to improve code quality and maintainability over time.

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This document by Victor Rentea focuses on the principles of clean code in enterprise Java, emphasizing the importance of readability, maintainability, and proper naming conventions. It covers various aspects such as the structure of functions, classes, and comments, advocating for small, self-explanatory methods and clear class designs to enhance team collaboration and code quality. The document also discusses advanced topics such as side effects, command/query separation, and the distinctions between objects and data structures to promote effective software development practices.

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Victor Rentea outlines key pitfalls in REST API design, emphasizing the importance of versioning, exposing only Data Transfer Objects (DTOs), and avoiding breaking changes. He advises on effective strategies such as separating commands from queries, utilizing bulk operations, and enhancing APIs with sub-resources and verbs. The document stresses that careful design can improve client experience and mitigate common issues faced in API development.

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