One language to rule them all type script
1 like289 views
TypeScript is a typed superset of JavaScript that optionally adds static typing to JavaScript code for improved maintainability. It supports features like classes, interfaces, and modules and compiles to plain JavaScript. The presentation introduced TypeScript's key features and syntax, showed how to configure TypeScript projects and add type annotations, and demonstrated building a simple end-to-end application with TypeScript. TypeScript is an open source language maintained by Microsoft that brings the benefits of static typing to JavaScript without losing JavaScript's dynamics.
One language to rule them all type script
- 1. One language to rule them all: TypeScript Gil Fink CEO and senior consultant, sparXys
- 2. About Me • sparXys CEO and senior consultant • Microsoft MVP in the last 8 years • Pro Single Page Application Development (Apress) co-author • 4 Microsoft Official Courses (MOCs) co-author • GDG Rishon and AngularUP co-organizer
- 3. Agenda • The why • TypeScript syntax and language features • Building a simple end-to-end app with TypeScript • Summary
- 5. "JavaScript is the assembly language of the Web" Erik Meijer
- 6. “You can write large programs in JavaScript. You just can’t maintain them” Anders Hejlsberg
- 7. Let’s Be Serious • JavaScript is really a powerful language: o Functional o Dynamic o Can run everywhere • Huge community • Big eco-system • Tools – IDEs, debuggers, test tools and etc.
- 8. The Alternatives • We have several alternatives: • Hard core vanilla JavaScript development • JavaScript transpilers • CoffeeScript – http://coffeescript.org • Dart – http://dartlang.org • Clojurescript - https://github.com/clojure/clojurescript • Script# - http://scriptsharp.com/
- 9. What is TypeScript? “TypeScript is a typed superset of JavaScript that compiles to plain JavaScript” ~typescriptlang.org
- 11. TypeScript is Very Flexible Any Browser Any Host Any OS Tool Support
- 12. Some TypeScript Key Features Support standard JavaScript code with static typing Encapsulation through classes and modules Support for constructors, properties and functions Interfaces and enums support Lambda and generics support Intellisense and syntax checking
- 13. • Modules • Classes • Arrow functions • Default parameters • Destructuring • Spread and rest • Let and const • for...of • Object literal methods • Shorthand properties • Computed properties • Octal / binary literals • Symbols • Template strings • Async/Await Features from the near Future of the Web (ES2015/6/7), Today Choose your compilation scenario. It is up to you!
- 14. From TypeScript to JavaScript class Greeter { greeting: string; constructor(message: string) { this.greeting = message; } greet() { return “Hi," + this.greeting; } } TypeScript Code JavaScript Code TypeScript Compiler var Greeter = (function () { function Greeter(message) { this.greeting = message; } Greeter.prototype.greet = function () { return “Hi," + this.greeting; }; return Greeter; })(); tsc.js
- 15. How Good is TypeScript’s Output?
- 16. tsconfig.json • Enables to configure the compiler options: o Target language (ES3, ES5, ES2015) o Module system (AMD, ES2015, CommonJS and etc.) o Source map generation o Remove comments when compiling o And more
- 18. Some Important Side Notes • All JavaScript code is TypeScript code o Simply copy and paste • All JavaScript libraries work with TypeScript o You will need a declaration file to work with the library
- 19. @Types Demo
- 20. TypeScript Type Annotations • You can add type annotations to variables and functions var str: string = ‘hello’; // str is annotated as string function foo(name: string) : string { // parameter and function annotated return ‘hello’ + name; }
- 21. TypeScript Types
- 23. Classes and Interfaces • You can define classes (same as in ES2015) • You can define interfaces o And implement them later interface IGreeter { greet(): void; } class Greeter implements IGreeter{ greeting: string; greet() { console.log(this.greeting); } } var Greeter = (function () { function Greeter() { } Greeter.prototype.greet = function () { console.log(this.greeting); }; return Greeter; })();
- 24. Modules • Uses ES2015 modules syntax export interface IGreeter { greet(): void; } export class Greeter implements IGreeter { greeting: string; greet() { console.log(this.greeting); } } var Greeter = (function () { function Greeter() { } Greeter.prototype.greet = function () { console.log(this.greeting); }; return Greeter; }()); exports.Greeter = Greeter;
- 26. Building a Simple End-to-End App with TypeScript Demo
- 27. TypeScript Versions • TypeScript 1.0 • TypeScript 2.0 • Current version: TypeScript 2.3.2
- 28. What’s New in TypeScript 2? • Generators and Iteration for ES5/ES3 • Type-checking for JavaScript files • Null- and undefined-aware types • ES2017 Spread and Rest • Improved any inference • Tagged union types • And a lot more
- 29. Summary • Open source language that compiles into JavaScript • Key features: • Code encapsulation • Maintainable code • Tooling support • Learn TypeScript today!
- 30. Resources • TypeScript – http://www.typescriptlang.org • TypeScript Source Code - https://github.com/Microsoft/TypeScript • My Website – http://www.gilfink.net • Follow me on Twitter – @gilfink
- 31. Thank You!
- 32. Questions?