@zambezi/caballo-vivo v1.3.0
= Caballo Vivo
quote, CJC 1177. los cementerios no deben estrenarse enterrando un hombre muerto sino un caballo vivo
Thin, opinionated layer for pure RxJS applications to connect with React-Router (or any router using history
). It has the advantage of scaling well, allowing more concise and expressive code and a better separation between business logic and view layer.
Here's the equivalent implementation of the Redux Reddit advanced tutorial with caballo-vivo, in less than 100 lines of code (https://codesandbox.io/s/caballo-vivo-reddit-w88kg[online sandbox]):
source,javascript
// type localStorage.setItem('cv-log', true) in the console to see the logs! import React from "react" import { render } from "react-dom" import { OrderedMap, Map } from "immutable" import { partialRight } from "ramda" import { Subject, merge, concat, of, from } from "rxjs" import { map, catchError, switchMap } from "rxjs/operators" import { Router, Switch, Route, Link } from "react-router-dom" import { createLocation$, createNavigateTo$, createStore$, history, flog, stow } from "@zambezi/caballo-vivo" import ClipLoader from "react-spinners/ClipLoader" import "./index.css"
const getPosts$ = new Subject()
const pathToIntent = OrderedMap([ "/:subreddit", ({ subreddit }) => getPosts$.next({ subreddit }), "/", () => getPosts$.next({ subreddit: "all" }) ])
const location$ = createLocation$(pathToIntent).pipe( // <1> map(location => state => state.set("location", location)) )
const redditJourney$ = getPosts$.pipe( // <2>
switchMap(({ subreddit }) =>
concat(
of(state => state.set("loading", true)), // <3>
from(fetch(https://www.reddit.com/r/${subreddit}.json
)).pipe(
switchMap(res =>
from(res.json()).pipe(
map(json => json.data.children.map(child => child.data))
)
),
stow("subreddit") // <4>
),
createNavigateTo$(subreddit), // <5>
of(state => state.set("loading", false))
)
),
catchError(() =>
of(state => state.set("error", "This subreddit is not available"))
)
)
merge(location$, redditJourney$) .pipe(createStore$(Map()), flog("Render state"), map(toView)) // <6> .subscribe(partialRight(render, document.getElementById("root")))
function toView(state) { // <7> if (state.has("error")) return {state.get("error")} if (state.get("loading")) return (
<div className="loader">
<ClipLoader />
</div>
)
return (
<section className="links">
{["all", "reactjs", "rxjs", "javascript", "node"].map(l => (
<Link key={l} to={l}>{`r/${l}`}</Link>
))}
</section>
<hr />
<Switch>
<Route path="/:subreddit">
<ul>
{state.get("subreddit").map(post => (
<li key={post.id}>
<a href={post.url} target="_blank" rel="noopener noreferrer">
{post.title}
</a>
</li>
))}
</ul>
</Route>
</Switch>
</Router>
)
}
<1> Passing a map to createLocation$
will block the hisory when the route changes and the new url matches one of the keys.
<2> We listen to the getPosts$
intent, triggered by the routes above, to kickstart a complex series of asynchronous events (set/unset loader flag, download subreddit).
<3> When we emit reducer functions, they get executed by the store (see below). All that a reducer function does is get the current state snapshot and return a new snapshot.
<4> https://github.com/zambezi/caballo-vivo/blob/master/src/stow.js[stow] is just an operator which emits a reducer function to set
the value received on a key or path in the store. This pattern is so common that it got its own operator.
<5> createNavigateTo$
unblocks the history and changes the address in the URL bar. At this point, all the routes matching the new address can render.
<6> createStore$
creates a store, which is an rxjs operator that has an initial value, takes reducers function in and spits state snapshots out.
<7> The view function is just a function which takes state snapshots in and generates JSX. Views and state / business logic are decoupled and interchangeable.
For a more advanced example application, please check: https://github.com/gabrielmontagne/fa-doodle
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