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The Future of React
Peter Piekarczyk
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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
•Polish
•Loves to Cycle
•ReasonML Lover
•Expo / React Native Lover
•Loves Plants (@petersplantss)
•Y Combinator Alumn
•Co-Founder of Draftbit
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Draftbit is a platform to
help you 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)
Config
(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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“Hey Peter…”
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“I think I broke
something…”
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15 min & 10
console.log’s later…
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Config.apiUrl
vs.
Config.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
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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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Desugars to JSX
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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 …
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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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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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That’ll be automated
soon, too ☺
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How do I add Reason to
my Javascript project?
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1. yarn add bs-platform —dev
2. add bsconfig.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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Where can I
learn more?
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Chicago
ReasonML Meetup
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ReasonML Discord
Google it
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Reason Conf US
Chicago • October 2019
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Keynote by Jordan Walke
Creator of React
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www.reason-conf.us
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Don’t be
that person
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BAEs
BEST. AUDIENCE. EVER.
draftbit.com/reason
draftbit • peterpme
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