A brief class that introduces the benefits TypeScript provides to large scale projects.

Prerequisites: JavaScript 202

TypeScript 101

TypeScript

🎓 Professor Frances Coronel

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fvcproductions

in/fvcproductions

Syllabus(1) TypeScript vs JavaScript 🎭

(2) The Rise of TypeScript’s Popularity 📈

(3) Homework Assignments 📚

W8, what is TypeScript? 🤔• free & open-source programming language

developed & maintained by Microsoft

• strict syntactical superset of JavaScript

• eases development of large scale applications written in JavaScript

• extends JavaScript by adding static types, classes, modules, interfaces & generics👶 5 years old

(1) TypeScript vs JavaScript 🎭

.ts .js

The Nitty Gritty 💻npm i -g typescript

Installing TypeScript

Compiling our file to JS

tsc multiplication.ts

Configuring options

touch tsconfig.json

npm i -g tslint

Optional Installing TSLint

JavaScript is TypeScript but TypeScript is not JavaScript.

Superset vs Subset 🔘

1. Referenced a symbol/variable which is not declared in program

2. Not able to fully infer the type of a particular variable and warns against using it as is

3. Even if your source code has TypeScript errors, it will still produce JavaScript code which you can execute

Spell Checker

What Types Provide

✓ modular development ✓ can be learned easily ✓ non-invasive ✓ long-term vision ✓ clean output

To Type or Not To TypePros of JavaScript

• EVERYWHERE • awesome libraries • flexible

Cons of JavaScript

• dynamic typing • lack of modularity • verbose patterns

(2) The Rise of TypeScript’s Popularity 📈

Companies ❤ TypeScript

Developers ❤ TypeScript

(3) Homework Assignments 📚

Option 1. 🎥 Watch the creator of TypeScript talk about TypeScript at the #MSBuild Conference

“What’s New In TypeScript” by Anders Hejlsberg

Option 2. 🎓 Enroll in an edX course on TypeScript created by Microsoft that starts tomorrow

Option 3. 🎮 Screw homework and go play instead!

typescriptlang.org/play

Thanks for listening! ☺

@fvcproductions

fvcproductions

in/fvcproductions

Slides will be uploaded ASAP at

speakerdeck.com/fvcproductions

Credits1. Mathematical Finn Photo: https://glarbinator.deviantart.com/art/Mathematical-Finn-417768395

2. TypeScript Official Website: http://www.typescriptlang.org/

3. Severus Snape Video: https://www.youtube.com/watch?v=PnOyBLT07R8

4. GitHub Icon: https://www.iconfinder.com/iconsets/ionicons

5. Twitter & LinkedIn Icons: https://www.iconfinder.com/iconsets/free-social-icons

6. Fonts: Segoe UI, SF Pro Text, Input Mono

7. Google Trends: https://g.co/trends/2M11R

8. TypeScript and JavaScript Logos: egghead.io

9. Stack Overflow 2017 Survey: https://insights.stackoverflow.com/survey/2017

10. TypeScript GIFs: http://twittervideodownloader.com/ & @typescriptlang

11. EdX Course: https://www.edx.org/course/introduction-typescript-2-microsoft-dev273x-0#!

12. List of Editors: https://www.wikiwand.com/en/TypeScript

Appendix

Why all the love?

1. Modular structure

2. Friendly with all editors

3. Scalable

4. Easy to learn

5. Easy to debug so less bugs!

1. Has Types

2. Good tooling and library support

3. Powers major production apps

4. Devs can be onboard fairly quickly

5. Should work on both client and server

😍

Evaluating the Popularity of a Programming Language 🤓

15 Most Popular Languages

On GitHub by Opened Pull Requests

With Percentage Change from Previous Year

Bonus Chapter - Jingle Time! 🎵

• You know that one part of class you weren’t really expecting but that you ended up enjoying anyways?

• This is that part.

TypeScript 101

We just had so much fun

ECMAScript was not enough

We want JavaScript that scales

And with types and transpilation

There is no way we can fail

TypeScript is super anal

Plus we get way less bugs

Just useeeee TypeScript.

Abstract Syntax Trees (AST)

Extracting Functions

My somewhat morbid dog analogy

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