Building maintainable web apps with Angular MS TechDays 2017

Oct 16, 2017Download as PPTX, PDF0 likes170 views

The document discusses several best practices for writing clean and maintainable Angular code. It recommends having a single responsibility for components and services with limited lines of code. It also suggests using consistent naming conventions across the application, extracting templates and styles, and applying dependency injection. The document provides examples of component interaction using input and output bindings as well as an example of a pipe for filtering data. It emphasizes principles like loose coupling, inheritance and reuse to build a well-structured application.

Building maintainable web apps with Angular MS TechDays 2017

“The ratio of time spent reading versus
writing is well over 10 to 1.
We are constantly reading old code as part
of the effort to write new code”

Boy Scouts have a rule regarding
camping, that they should leave the
campground cleaner than
they found it. ... By ensuring that the
campground is cleaner when they
leave than it was when
they arrived.

Readability is king!
Use consistent naming through chain
(DB -> WebApi -> Angular)
Ubiquitious language (DDD) | Vocabulary
Naming guidance:
https://angular.io/guide/styleguide

Symbol name with suffix (.component.ts, .service.ts)
Functional naming (NavigationComponent,
LoggerService)
Do use PascalCasing when naming classes, interfaces
Do use camelCasing to name properties and methods

One Component per file
Do make locating code intuitive, simple and fast
Do create folders named for the feature area they
represent
Do extract templates and styles into a separate file,
when more than 3 lines

DEMO
Example naming/structuring in Angular

A class should have just a single responsibility
Design for low coupling and high cohesion

Apply the single responsibility principle to all
components, services, and other classes
The number of functions on a class should be very
limited
The number of lines of each function should be
very limited

Child 2
@OUTPUT
A component can send data to its parent by triggering an event the parent listens to
@INPUT
A component can receive data from its parent
Parent
Child 1
@OUTPUT
@INPUT

Child 2
Feature
component
Child 1
@OUTPUT
@INPUT
@INPUT

Presentation
component 2
Feature
component
Presentation
component 1
@OUTPUT
@INPUT
@INPUT

Consider feature/presentation
components
Consider using inheritance (DRY)
Consider shared components (DRY)
Rethink/Refactor your hierarchy when
needed

A class receives its dependencies from external
sources rather than creating them itself.
Create a loosely coupled system
Angular ships with its own dependency injection
framework

import { Injectable } from '@angular/core';
import { IFilter } from '../interfaces/IFilter';
@Injectable()
export class SessionstorageService {
public loadFilter(): IFilter {
. . .
return filter;
}
public saveFilter(filter: IFilter): void {
. . .
}
}
@Component()
export class FilterComponent {
constructor(private sessionStorageService: SessionStorageService)
}

@Pipe({name: 'processNameFilter'})
export class ProcessNameFilter implements PipeTransform {
transform(processes: Process[], args: any) : Process[] {
if (!args || !processes) {
return processes;
}
return processes.filter(p => p.name.toLowerCase().indexOf(args.toLowerCase()) > -1 ||
p.productgroup.toLowerCase().indexOf(args.toLowerCase()) > -1
);
}
}
<table id="withOrder"
class="table table-striped"
[mfData]="processes | processNameFilter:processSearchKey"
#mf="mfDataTable”>

Support for multiple environments:
(Test, Acceptance, Production)
Supporting hotfixes and parallel development
Feature branches

Guards against changes that break existing code
(“regressions”).
Clarifies what the code does, it is a specification.
Reveals mistakes in design and implementation.

Isolated unit tests for pipes and services
Angular testing utillities for Components
Karma/Jasmine integration
https://angular.io/guide/testing

Be careful, mileage may vary
Can block your Angular upgrade path
Consider Angular Material UI
or
Commercial UI component library

"@angular/cli": "1.2.0",
"@angular/compiler-cli": "^4.0.0",
"@angular/language-service": "^4.0.0",
"@types/jasmine": "~2.5.53",
"@types/jasminewd2": "~2.0.2",

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Building maintainable web apps with Angular MS TechDays 2017

8. “The ratio of time spent reading versus writing is well over 10 to 1. We are constantly reading old code as part of the effort to write new code”

11. Boy Scouts have a rule regarding camping, that they should leave the campground cleaner than they found it. ... By ensuring that the campground is cleaner when they leave than it was when they arrived.

12. Readability is king! Use consistent naming through chain (DB -> WebApi -> Angular) Ubiquitious language (DDD) | Vocabulary Naming guidance: https://angular.io/guide/styleguide

13. Symbol name with suffix (.component.ts, .service.ts) Functional naming (NavigationComponent, LoggerService) Do use PascalCasing when naming classes, interfaces Do use camelCasing to name properties and methods

14. One Component per file Do make locating code intuitive, simple and fast Do create folders named for the feature area they represent Do extract templates and styles into a separate file, when more than 3 lines

15. DEMO Example naming/structuring in Angular

17. A class should have just a single responsibility Design for low coupling and high cohesion

18. Apply the single responsibility principle to all components, services, and other classes The number of functions on a class should be very limited The number of lines of each function should be very limited

20. Child 2 @OUTPUT A component can send data to its parent by triggering an event the parent listens to @INPUT A component can receive data from its parent Parent Child 1 @OUTPUT @INPUT

21. Child 2 Feature component Child 1 @OUTPUT @INPUT @INPUT

22. Presentation component 2 Feature component Presentation component 1 @OUTPUT @INPUT @INPUT

23. Consider feature/presentation components Consider using inheritance (DRY) Consider shared components (DRY) Rethink/Refactor your hierarchy when needed

24. A class receives its dependencies from external sources rather than creating them itself. Create a loosely coupled system Angular ships with its own dependency injection framework

25. import { Injectable } from '@angular/core'; import { IFilter } from '../interfaces/IFilter'; @Injectable() export class SessionstorageService { public loadFilter(): IFilter { . . . return filter; } public saveFilter(filter: IFilter): void { . . . } } @Component() export class FilterComponent { constructor(private sessionStorageService: SessionStorageService) }

26. @Pipe({name: 'processNameFilter'}) export class ProcessNameFilter implements PipeTransform { transform(processes: Process[], args: any) : Process[] { if (!args || !processes) { return processes; } return processes.filter(p => p.name.toLowerCase().indexOf(args.toLowerCase()) > -1 || p.productgroup.toLowerCase().indexOf(args.toLowerCase()) > -1 ); } } <table id="withOrder" class="table table-striped" [mfData]="processes | processNameFilter:processSearchKey" #mf="mfDataTable”>

28. Support for multiple environments: (Test, Acceptance, Production) Supporting hotfixes and parallel development Feature branches

31. Guards against changes that break existing code (“regressions”). Clarifies what the code does, it is a specification. Reveals mistakes in design and implementation.

32. Isolated unit tests for pipes and services Angular testing utillities for Components Karma/Jasmine integration https://angular.io/guide/testing

33. DEMO Testing Angular with Karma/Jasmine

34. Be careful, mileage may vary Can block your Angular upgrade path Consider Angular Material UI or Commercial UI component library

35. "@angular/cli": "1.2.0", "@angular/compiler-cli": "^4.0.0", "@angular/language-service": "^4.0.0", "@types/jasmine": "~2.5.53", "@types/jasminewd2": "~2.0.2",

36. Q & A

Building maintainable web apps with Angular MS TechDays 2017

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