TypeScript

Ryan Hayes

#TriJS Meetup

9/9/2014

State of the Web

• HTML5/CSS3 is awesome!
• Browsers are hardware accelerated!
• BIG Single Page JS Apps!
• Javascript is living in the 90s
• This is how I feel when I use JavaScript ----------------------->

Q: What's the Problem?

A: JavaScript wasn't designed for large-scale applications.

What's being done?

• ECMAScript 6
  • Not Ready
• CoffeeScript
  • Ruby-like syntax
  • Concise
• Google's Dart
  • C#-like
  • Separate IDE/Eclipse
• TypeScript

What is TypeScript?

• Superset of JavaScript (JS *is* TS)
• Compiles to JS
• Totally Optional
• It's ECMAScript 6 today + Types!
• Open Source, Node.JS compiler

Syntactic Sugar (n.):

Syntax within a programming language designed solely for human benefit in understanding or expression in a more clear and concise way.

TypeScript Provides

• Classes
• Interfaces
• Modules (packages/namespaces)
• Definition files (.d.ts) for libraries (Intellisense!!)
• Easy inheritance/composition
• Typing/type-checking in your IDE