end to-end apps with type script
TRANSCRIPT
End-to-end Apps with TypeScript
Gil Fink
CEO and Senior Consultant, sparXys
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
Agenda • The why
• TypeScript syntax and language features
• Building a simple end-to-end app with TypeScript
• Summary
"JavaScript is the assembly language of the Web"
Erik Meijer
“You can write large programs in JavaScript. You
just can’t maintain them”
Anders Hejlsberg
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.
What is TypeScript? “TypeScript is a typed superset of JavaScript that compiles to
plain JavaScript” ~typescriptlang.org
Hello TypeScript Demo
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
• 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
Features from the near Future of
the Web (ES2015/6), Today
Choose your compilation scenario.
It is up to you!
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
tsconfig.json • Enables to configure the compiler options:
o Target language (ES3, ES5, ES6)
o Module system (AMD, ES6, CommonJS and etc.)
o Source map generation
o Remove comments when compiling
o And more
tsconfig.json Demo
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
TypeScript Type Annotations
• You can add type annotations to variables and
functions
• If not added, types are inferred by their context
var str: string = ‘hello’; // str is annotated as string
function foo(name: string) : string { // parameter and function annotated
return ‘hello’ + name;
}
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;
})();
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;
Types, Classes, Modules and Interfaces
Demo
Building a Simple End-to-End App with TypeScript
Demo
TypeScript Versions • TypeScript 1.0
• TypeScript 2.0
• Current version: TypeScript 2.2 (since last week )
Summary • Open source language that compiles into
JavaScript
• Key features: • Code encapsulation
• Maintainable code
• Tooling support
• Learn TypeScript today!
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
Thank You!