Clean JavaScript. English Edition by Software Crafters

Author:Software Crafters [Software Crafters]
Language: eng
Format: epub, mobi
Publisher: leanpub.com
Published: 2021-05-16T00:00:00+00:00

Applying the SRP

Returning to the example, one way to separate these responsibilities could be by moving each of the functions of the UseCase class to others, like this :

1 class UseCase{ 2 constructor(repo, notifier){ 3 this.repo = repo; 4 this.notifier = notifier; 5 } 6 7 doSomethingWithTaxes(){ 8 console.log("Do something related with taxes ...") 9 } 10 11 saveChanges(){ 12 this.repo.update(); 13 } 14 15 notify(){ 16 this.notifier.notify("Hi!") 17 } 18 } 19 20 class Repository{ 21 add(){ 22 console.log("Adding in database"); 23 } 24 25 update(){ 26 console.log("Updating in database..."); 27 } 28 29 remove(){ 30 console.log("Deleting from database ..."); 31 } 32 33 find(){ 34 console.log("Finding from database ..."); 35 } 36 } 37 38 39 class NotificationService{ 40 notify(message){ 41 console.log("Sending message ..."); 42 console.log(message); 43 } 44 } 45 46 47 function start(){ 48 const repo = new Repository() 49 const notifier = new NotificationService() 50 const myUseCase = new UseCase(repo, notifier) 51 52 myUseCase.doSomethingWithTaxes(); 53 myUseCase.saveChanges(); 54 myUseCase.notify(); 55 } 56 57 start();

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