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ReasonML The Future of React Peter Piekarczyk⨠Co-founder, Draftbit
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PIES ⢠CARS ⢠CHICKS
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Peter Piekarczyk â˘Y Combinator Alumn â˘Huge Expo / React Native Fan â˘Loves Plants (@petersplantss) â˘Loves Cycling â˘Loves ReasonML â˘Co-Founder of Draftbit
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Draftbit helps your team build mobile apps visually
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1. Scan QR Code 2. Drag Component 3. Export Code
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Layers (Js) Frame (Yoga / Wasm / Reason) ConďŹg (JS / Reason) Live Preview / Code Gen (Reason) Navigator (Reason)
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Early days at a startup are⌠hard
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Draftbit needed to move faster to survive
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We gave Reason a shot & never looked back
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Draftbit Stack ⢠React & ReasonML ⢠Web Assembly ⢠Expo ⢠GraphQL & Apollo ⢠Postgres
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We used to start with Javascript
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âHey PeterâŚâ
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âI think I broke somethingâŚâ
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15 min & 10 console.logâs laterâŚ
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ConďŹg.apiUrl⨠vs.⨠ConďŹg.apiURL
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Life Before 2015 Backbone Angular RequireJS jQuery Bower Gulp MVC CoffeeScript
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Life After 2015 Flowtype Eslint Babel Typescript Redux Yarn Prettier React Immutable
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What do you get when you take all that shit
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& make it easy?
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You get Reason
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⢠Created by React creator ⢠Familiar Javascript syntax ⢠Battle-tested language ⢠Friendly compiler ⢠Multiple compile targets
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What language was React originally written in?
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StandardML
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What is Reason?
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Javascript as a statically typed,
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functional language, with a friendly compiler
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& amazing developer productivity
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If it compiles, it works
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What is OCaml?
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A functional programming language
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With twenty years of type theory,
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Powerful pattern matching, functions
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& a robust ecosystem of packages (OPAM)
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⢠Compiles >10x faster than Babel ⢠Eliminates typical JS errors ⢠Easy to use within your existing JS app ⢠Compiled code is easy to debug
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Fast AF Compile Times TypeScript Scala
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CRA 3.0 REASON
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What does a React component look like?
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Similar, but a little different, right?
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All your jsx is typed
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Why is this valuable?
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Because uncertainty is the devil
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We all know what uncertainty is already like âŚ
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Web Developer
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Pipe First makes it easy to read composable functions
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[1, 2, 3] is a List
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Lists are immutable, homogeneous & fast AF
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Belt is the standard library shipped with Reason
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A built-in lodash just for Reason
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Convert your immutable list into an array
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Convert your array into a React element
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*both Lists & Arrays are supported
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Hooks are the future
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Have you heard about Hooks?
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Tuples are immutable, ordered & heterogeneous
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Pattern matching is a switch statement on steroids
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Why is Tick capitalized?
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Tick is not a string, its a constructor
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Variants offer a powerful way of representing complex data
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Variants allow you to express this OR that
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Constructors can take arguments, too!
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genType generates bindings between Reason & JavaScript
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genType supports Typescript & Flowtype
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Can I use my existing Javascript components in Reason?
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**This part kinda sucks, but will be automated soon âş
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How do I add Reason to my Javascript project?
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1. yarn add bs-platform âdev 2. add bsconďŹg.json 3. add script tags
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ReasonML⨠(.re, .rei) OCaml⨠(.ml, .mli) OCaml AST Bytecode Native code JavaScript
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BuckleScript
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Write safer, simple, readable code that compiles to JavaScript
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The compiled JavaScript is readable
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The compiled JavaScript is faster
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ImmutableJS Map 3415ms
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Reason Immutable Map 1186ms
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Tree Shaking is %
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Webpack 55,000 Bytes
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Bucklescript 899 Bytes
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BuckleScript has a deep integration with JS libs
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Binding Javascript to Reason
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*Getting this right is the hardest part
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There are bindings for almost every library
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Is Reason ready for production?
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Companies Shipping Reason
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(& many more)
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*These companies arenât startups, theyâre BIG businesses
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messenger.com is completely written in Reason
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Where can I learn more?
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Your local ReasonML Meetup
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ReasonML Discord Google it
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Reason Conf US Chicago ⢠October 8th 2019
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Keynote by Jordan Walke Creator of React
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https:/ /reason-conf.us
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Donât be that person
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BAEs BEST. AUDIENCE. EVER. draftbit.com/reason draftbit ⢠peterpme