TypeScript

TypeScript Language
Serdar Sert | Software Infrastructure
TypeScript

AGENDA
 What’s JavaScript
 What’s TypeScript ?
 Why TypeScript ?
 Features
 Development Environment
 Language Specification (Demo)
 Alternatives

JAVASCRIPT
What’s JavaScript ?
 JavaScript is the most
popular programming
language in the world.

What’s JavaScript ?
 JavaScript is a programming language used to
make web pages interactive.

What’s JavaScript ?
 JavaScript was
really never
designed to be a
programming
language. It’s a
scripting language.

What’s Good About JAVASCRIPT?
 It’s everywhere

 Huge amount of libraries

 Flexible

JAVASCRIPT
What’s wrong in JavaScript ?

What’s wrong in JAVASCRIPT?
 Dynamic typing

What’s wrong in JAVASCRIPT?
 Lack of modularity

TYPESCRIPT
 TypeScript is an open source
language and compiler written
by Microsoft.
 Adds optional static typing and
class-based object oriented
programming to the javascript
language

TYPESCRIPT
He was the original author of Turbo
Pascal and the chief architect
of Delphi. He currently works
for Microsoft as the lead architect
of C# and core developer
on TypeScript. Anders Hejlsberg

TYPESCRIPT
What Is TypeScript?
 Superset of JavaScript
 Contains all of
JavaScript. And much
more !

What’s TypeScript?
 Transpile ES6 to ES5

 Leverage some future(ES7) features

 Compiles to plain JavaScript

 No special runtime

 Any browser. Any host. Any OS.

 Open Source.

Why TypeScript?
 TypeScript works
with all JavaScript
frameworks,
libraries.

Why TypeScript?
Strong Typing
 Catch errors at compile time.
 Better tooling (refactoring,
autocomplete,intellisense)
 Explicitly express intent

Class-based object orientation
tsc
mainController.ts
var x: number;
class mainController { }
mainController.js
var x;
function mainController { }
cscmainController.cs mainController.dll

Why TypeScript?
At Development Time
 Better type checking
 More powerful refactoring experience
 Class-based object oriented programming
techniques
At Deployment Time
 It’s just JavaScript

Development Environment
Node.js
The command-line TypeScript compiler
can be installed as a Node.js package.
npm install -g typescript
tsc helloworld.ts
Tools
Visual Studio includes TypeScript in the box, starting with
Visual Studio 2013 Update 2.
You can also edit TypeScript in VS Code, WebStorm, Atom,Sublime Text,
and Eclipse.
Open Source
TypeScript is being developed on GitHub. The TypeScript compiler is implemented
in TypeScript, and can be used in any JavaScript host.

Alternatives
http://coffeescript.org/ https://www.dartlang.org/
AtScript

TypeScript

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