About Me

• Senior Web Developer at 8 Securities
• Working with Ionic2/Angular2

• Using typescript since 0.8 (Feb 2013 ☺)

@valter_s_matos

linkedin.com/in/valtermatos

github.com/ValterSantosMatos

Part 1/3

Why?

Do you know what "WAT" means?

Javascript books

javascript the good parts

vs

javascript the definitive guide

Why Typescript?

• can make the code easier to maintain
• can make code more readable
• can allow for reliable refactoring
• can allow for generally better IDE support
• can catch errors early

Part 2/3

What is Typecript

• Superset of javascript
• Transpiles to plain javascript
• Let us use features from ES7 and ES6 today
• Created in 2012 by Microsoft
• Current version: 1.8
• Open source

Typescript is...

Types

• boolean
• number
• string
• array
• tuple
• enum
• any
• void

Classes

Inheritance

Generics

Unions and Type Guards 

Interfaces

Modules

Namespaces

Decorators

more...

Declaration files

To get the type information of an external JavaScript library we can use a type declaration file (.d.ts).

Part 3/3

Epilogue

Comparison - my opinion!

• ​Typescript vs. CoffeeScript

  • Not experienced in CoffeeScript but the trend in the next chart is clear!

• ​Typescript vs. ES6

  • Typescript is ES6 plus a type-checker. Both need a transpiler (generally Babel in case of ES6).

• TypeScript vs. Dart / Elm / PureScript

  • Typescript is Javascript while the others aren't.

• TypeScript vs. Flow (type checker by facebook)

  • Not enough experience with flow, although the ecosystem of typescript is way bigger.

Comparison - google trends

Should I use a Typescript?

Initial effort to add typescript is low, but it will require some time to learn typescript.

• No if your project is really simple
• No if your project will have a short life

• Yes if there is a chance you will have to refactor it
• Yes if its very important for your company
• Yes if people enter or leave the team frequently
• Yes if you will use Angular2

THANK YOU!

Questions

@valter_s_matos