Typescript簡介

What is typescript?
Typescript = Javascript + Type system

TypeScript vs JavaScript:

Advantage of TypeScript over JavaScript  

• TypeScript always highlights errors at compilation time during the time of development, whereas JavaScript points out errors at the runtime.
• TypeScript supports strongly typed or static typing, whereas this is not in JavaScript.
• TypeScript runs on any browser or JavaScript engine.
• Great tooling supports with IntelliSense, which provides active hints as the code is added.
• It has a namespace concept by defining a module.

Disadvantage of TypeScript over JavaScript

• TypeScript takes a long time to compile the code.
• TypeScript does not support abstract classes.
• If we run the TypeScript application in the browser, a compilation step is required to transform TypeScript into JavaScript.