TypeScript 101 - Speaker Deck

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A brief class that introduces the benefits TypeScript provides to large scale projects. Prerequisites: JavaScript 202 TypeScript 101

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Professor Frances Coronel @fvcproductions fvcproductions in/fvcproductions

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Syllabus (1) TypeScript vs JavaScript (2) The Rise of TypeScript’s Popularity (3) Homework Assignments

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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

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(1) TypeScript vs JavaScript .ts .js

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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

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JavaScript is TypeScript but TypeScript is not JavaScript. Superset vs Subset

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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

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What Types Provide ✓ modular development ✓ can be learned easily ✓ non-invasive ✓ long-term vision ✓ clean output To Type or Not To Type Pros of JavaScript • EVERYWHERE • awesome libraries • flexible Cons of JavaScript • dynamic typing • lack of modularity • verbose patterns

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(2) The Rise of TypeScript’s Popularity

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Companies ❤ TypeScript

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Developers ❤ TypeScript

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(3) Homework Assignments

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Option 1. Watch the creator of TypeScript talk about TypeScript at the #MSBuild Conference “What’s New In TypeScript” by Anders Hejlsberg

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

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Option 3. Screw homework and go play instead! typescriptlang.org/play

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Thanks for listening! ☺ @fvcproductions fvcproductions in/fvcproductions Slides will be uploaded ASAP at speakerdeck.com/fvcproductions

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Credits 1. 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