TypeScript 1.6 - How I learned to Stop Worrying and Love JavaScript

Feb 17, 2016Download as pptx, pdf1 like466 views

The Web is all around us - and there's more of it every day. Soon we'll have a web-powered refrigerator and a web-enabled toaster. And where there's web there's JavaScript - with all its great and not so great features. Whether you like it or not, if you are a developer today, you are a JavaScript developer. So there's a problem, because lots of people don't really like writing JavaScript, so there's a whole host of tools that will help us to avoid that. TypeScript is a language that is not afraid of JavaScript, it embraces all the good things and adds a lot of its own goodness. After three years of active development, it's getting to where it set out to be, and is becoming the thing we all need - a tool for high speed, high quality development of web-oriented code.

Nov 21, 2015Nov 23, 2014
Sofia
var title = “TypeScript 1.6”;
var subtitle= “How I Learned to Stop Worrying and Love JavaScript”;
var info = {
author: “Wekoslav Stefanovski”,
level: “Beginner”,
about: “TypeScript”,
type: [“Intro”, “What’s New”]
};

Nov 21, 2015
var agenda: IAgenda;
interface IAgenda {
whatIsJavaScript: string;
loveHateJavaScript: { [id:string]: boolean};
isTypeScriptNeeded: boolean;
majorFeatures: IFeature[];
canHasES6: boolean;
demos: Demo[]
}

Nov 21, 2015
JavaScript
The good, the bad and the ugly

Nov 21, 2015
• Prototype-based dynamic scripting language
• Is it a functional language?
• Is it object-oriented?
• It can be completely instable and untestable
• It can be absurdly undocumented
• Still, the universal language of the web
• Some people also use it server-side, even for databases
What is this JavaScript thing?

Nov 21, 2015
• Implicit globals
• Variable hoisting
• Truthy and falsy values
• Semicolon insertion
• Absurd handling of this
• Whatever it is that the ‘+’ operator is doing
• Typelessness
• Prototype inheritance
What I hate about JavaScript?

Nov 21, 2015
• Functions as first-class objects
• Openness to extension
• Malleability (polyfill)
• Prototype inheritance
• Again, functions as first-class objects
What I love about JavaScript?

Nov 21, 2015
TypeScript
A Few Good Types

Nov 21, 2015
• JavaScript’s got 99 problems but types ain’t one
• Neither are namespaces
• Nor explicit references
• Custom types that work as you would expect them to
• Structural interfaces to keep the malleability
• Fixed this references
• Fixed unintended globals & hoisting
• Somewhat fixed booleans (by formalizing)
Where does TypeScript fit in?

Nov 21, 2015
• Incredibly easy to pick up
• Incredibly easy to let go
• Use as much of it as you need
• Wonderful tooling support
• Fanatical devotion to backward and forward compatibility
• Compatible with most E6 concepts - now
Why I love TypeScript?

Nov 21, 2015
• Classes
• Interfaces
• Generics
• Lexical scoping
• Enums
• Modules
• Ambient declarations
Major TypeScript features

Nov 21, 2015
• Classes
• Arrow functions (lambdas)
• Rest parameters
• let
• const
• Desctructuring
• for..of
• Template strings
• Spread operator
• Enums
ES6 features

Nov 21, 2015
• Classes
• Structural and formal interfaces
• Generics
• Private, protected, and public methods
• Formal constructors
• Limited method / constructor overloading
• Easy ambient declarations
Type System

Nov 21, 2015
• JavaScript is not going to go away
• The JavaScript ecosystem is getting richer and richer
• And the language is quite stagnant
• TypeScript gives us the best of both worlds
• Even better server-side experience
Bottom Line
TypeScript brings back the joy of
client-side development
(at least, it did for me)

Nov 21, 2015
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1. Nov 21, 2015Nov 23, 2014 Sofia var title = “TypeScript 1.6”; var subtitle= “How I Learned to Stop Worrying and Love JavaScript”; var info = { author: “Wekoslav Stefanovski”, level: “Beginner”, about: “TypeScript”, type: [“Intro”, “What’s New”] };

2. Nov 21, 2015 var agenda: IAgenda; interface IAgenda { whatIsJavaScript: string; loveHateJavaScript: { [id:string]: boolean}; isTypeScriptNeeded: boolean; majorFeatures: IFeature[]; canHasES6: boolean; demos: Demo[] }

3. Nov 21, 2015 JavaScript The good, the bad and the ugly

4. Nov 21, 2015 • Prototype-based dynamic scripting language • Is it a functional language? • Is it object-oriented? • It can be completely instable and untestable • It can be absurdly undocumented • Still, the universal language of the web • Some people also use it server-side, even for databases What is this JavaScript thing?

5. Nov 21, 2015 • Implicit globals • Variable hoisting • Truthy and falsy values • Semicolon insertion • Absurd handling of this • Whatever it is that the ‘+’ operator is doing • Typelessness • Prototype inheritance What I hate about JavaScript?

6. Nov 21, 2015 • Functions as first-class objects • Openness to extension • Malleability (polyfill) • Prototype inheritance • Again, functions as first-class objects What I love about JavaScript?

7. Nov 21, 2015 TypeScript A Few Good Types

8. Nov 21, 2015 • JavaScript’s got 99 problems but types ain’t one • Neither are namespaces • Nor explicit references • Custom types that work as you would expect them to • Structural interfaces to keep the malleability • Fixed this references • Fixed unintended globals & hoisting • Somewhat fixed booleans (by formalizing) Where does TypeScript fit in?

9. Nov 21, 2015 • Incredibly easy to pick up • Incredibly easy to let go • Use as much of it as you need • Wonderful tooling support • Fanatical devotion to backward and forward compatibility • Compatible with most E6 concepts - now Why I love TypeScript?

10. Nov 21, 2015 • Classes • Interfaces • Generics • Lexical scoping • Enums • Modules • Ambient declarations Major TypeScript features

11. Nov 21, 2015 • Classes • Arrow functions (lambdas) • Rest parameters • let • const • Desctructuring • for..of • Template strings • Spread operator • Enums ES6 features

12. Nov 21, 2015 • Classes • Structural and formal interfaces • Generics • Private, protected, and public methods • Formal constructors • Limited method / constructor overloading • Easy ambient declarations Type System

13. Nov 21, 2015 • JavaScript is not going to go away • The JavaScript ecosystem is getting richer and richer • And the language is quite stagnant • TypeScript gives us the best of both worlds • Even better server-side experience Bottom Line TypeScript brings back the joy of client-side development (at least, it did for me)

14. Nov 21, 2015 Thanks to our Sponsors: General Sponsor: Gold Sponsors: Swag Sponsors: Media Partners: Silver Sponsors: Technological Partners: Bronze Sponsors:

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