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ReasonML @ OCaml Users in Paris
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Matthias Le Brun
September 26, 2017
Programming
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ReasonML @ OCaml Users in Paris
Matthias Le Brun
September 26, 2017
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Transcript
REASON
Matthias Le Brun twitter.com/bloodyowl github.com/bloodyowl Putain de code !
OCaml
let rec qsort = function | [] !-> [] |
pivot #:: rest !-> let is_less x = x < pivot in let left, right = List.partition is_less rest in qsort left @ [pivot] @ qsort right
Syntax isn't really friendly to newcomers
FP communities aren’t really welcoming to newcomers
None
Here comes Reason
Storytime •Initially, React was written in SML by Jordan Walke
•The idea for Reason actually predates React •Front-end community wasn’t ready yet
1. Syntax 2. Tooling 3. Ecosystem 4. Community
1. Syntax 2. Tooling 3. Ecosystem 4. Community
Functions let x a b = e let x =
fun a b !-> e OCaml Reason let x a b %=> e; let x = fun a b %=> e;
Equality a = b b '== c a #<> b
a *!= b OCaml Reason a '== b b ##=== c a *!= b a --!== b
Expressions let c = let a = "a" in let
b = "b" in a ^ b OCaml Reason let c = { let a = "a"; let b = "b"; a ^ b };
Tuples type tup = int * int let tuple =
a, b OCaml Reason type tup = (int, int) let tuple = (a, b)
Record types type rec = { foo: string; bar: string
}; OCaml Reason type rec = { foo: string, bar: string };
Records { foo = "bar"; bar = "baz" } OCaml
Reason { foo: "bar", bar: "baz", }
Lists [1; 2; 3] OCaml Reason [1, 2, 3]
Type params string option list OCaml Reason list (option string)
Variants type foo = | A of string | B
of string OCaml Reason type foo = | A string | B string
Pattern matching match a with | A x %=> "A"
^ x | B x %=> "B" ^ x OCaml Reason switch a { | A x %=> "A" ^ x | B x %=> "B" ^ x }
Equality (* comment *) OCaml Reason //* comment -*/
Refmt: one language, one formatting
ReasonFatigue prevented ☕
Syntax simpler to JS folks
1. Syntax 2. Tooling 3. Ecosystem 4. Community
BuckleScript
BuckleScript •Like js_of_ocaml but takes on after an earlier step
of compilation •Makes some optimisations considering the JS target •Great interoperability
Produces code that’s faster than vanilla™
Smaller footprint var user = //* record -*/[ //* username
-*/"Bob", //* id : Some -*/["abc"], //* age -*/32 ];
[ "Bob", ["abc"], 32 ]; Smaller footprint
Don’t want to rewrite your project from scratch?
external myExistingModule : string = [@@bs.module "-../myExistingModule"]; Use JS
type user = { name: string, age: int }; let
fromJs jsObject %=> { name: jsObject###name, age: jsObject###age }; Convert from JS
let toJs object %=> { "name": object.name, "age": object.age };
Convert to JS
{ "message_type": "image" | "string", "value": string } Complex conversions
type message = | Image string | String string; let
fromJs js %=> { switch js###message_type { | "image" %=> Image js###value | "string" | _ %=> String js###value } } Complex conversions
Lots of bindings existing/on the way
let getPageKeywords () %=> switch ( DomRe.Document.querySelector "meta[name=\"keywords\"]" DomRe.document )
{ | Some meta %=> switch (DomRe.Element.getAttribute "content" meta) { | Some content %=> Js.String.split "," content *|> Array.to_list *|> List.map String.trim | None %=> [] } | None %=> [] };
None
BetterErrors
Simpler workflow •Effort is for now a lot on the
JS back-end •Coming for native compilation
1. Syntax 2. Tooling 3. Ecosystem 4. Community
ReasonReact
ReactJS import React from "react"; import { string } from
"prop-types"; const App = props %=> ( <div> {props.message} !</div> ) App.propTypes = { message: string.isRequired };
ReasonReact let component = ReasonReact.statelessComponent "App"; let make #::message _children
%=> { …component, render: fun _ %=> <div> (ReasonReact.stringToElement message) !</div> };
ReasonReact type state = int; type actions = | Increment
| Decrement;
ReasonReact let component = ReasonReact .reducerComponent "App"; let make _
%=> { …component, reducer: fun action state %=> switch action { | Increment %=> ReasonReact.Update (state + 1) | Decrement %=> ReasonReact.Update (state - 1) }, //* … -*/ }
ReasonReact render: fun {state, reduce} %=> <div> (ReasonReact.stringToElement (string_of_int state))
<Button title="-" onClick=(reduce (fun _ %=> Increment)) 6/> !</div>
<div> (switch resource { | Loading %=> <ActivityIndicator 6/> |
Idle value %=> <Component value 6/> | Error %=> ErrorMessage.serverError }) !</div> ReasonReact
module MyType = { let name = "Type"; type t
= string; }; module MyTypeCollectionView = Primitives.FixedCollectionView.Make MyType; <MyTypeCollectionView items 6/> ReasonReact
let jsComponent = ReasonReact.wrapReasonForJs #::component (fun jsProps %=> make message#::jsProps###message
[#||] ); ReasonReact
let make #::message children %=> ReasonReact.wrapJsForReason #::reactClass props#::{"message": message} children;
ReasonReact
ReasonReact: good entry point for the front-end community
1. Syntax 2. Tooling 3. Ecosystem 4. Community
Community
Lots of meetups popping up
1. Syntax 2. Tooling 3. Ecosystem 4. Community Sum up
• A new, simpler syntax for OCaml • Lots of
efforts in improving tooling (BetterErrors, BuckleScript is a friend project) • New features like JSX • A new community (super active at the moment) • A great core team who knows what to prioritise first to make it good for everyone
Thank you! Questions?