ultrasonicsoft / singleton-pattern

Implementing Singleton design pattern in Typescript

Singleton Design pattern implemented in Typescript

Design

• PrinterService - It is a Singleton class which provide service print to its client.
• EmailClient - Prints email via PrinterService
• PdfClient - Prints pdf content via PrinterService
• main.ts - Main program which creates objects of Email and Pdf and prints.

Running program

tsc *.ts && node main.js

Output

Printing: Mail 1.
Printing: Mail 2.
Printing: Mail 3.
Print copies: 3
creating new printer instance....
Printing: Pdf 1.
Printing: Pdf 2.
Print copies: 5```