Progscon 2017: Taming the wild fronteer - Adventures in Clojurescript
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Transcript of Progscon 2017: Taming the wild fronteer - Adventures in Clojurescript
Taming the wild fronteerAdventures in Clojurescript
by John Stevenson @jr0cket practicalli.github.io/clojurescript
@jr0cketSpeaker, author, conference organiser
& community obsessed developer.
Loves Clojure, Spacemacs, Cats, Cycling & Agile development.
@Heroku@SalesforceDevs
In a galaxy far, far away…
Taming The Wild FronteerJavascript is a highly pervasive platform...
Javascript as a platform is everywhere
@jr0cket
Many programming languages have their quirks…
@jr0cket
www.destroyallsoftware.com/talks/wat
A common view of Javascript as a language
@jr0cket
Complex languages
… are not easily reasoned about by humans
@jr0cketJosh Smith - Tweet Original Gif
ClojureScriptA general purpose language made from decades of design
From Javascript to Clojurescript
f(x) -> (f x);; First element of a list is a function call
var foo = “bar” -> (def foo “bar”);; bind a name to a value or function
@jr0cket
Clojurescript - basic syntax(ns clojure.awesome ) ;; define a namespace (scoping)
(defn function-name [args] (behaviour)) ;; define a function, with arguments(function-name data) ;; call a function with the data as its argument
(def name “data-or-value”) ;; bind a name to data within the namespace scope(let [name “data-or-value”]) ;; bind a name to a data within the let scope (local)
:keyword-name ;; a keyword is a name (symbol) that points to itself
;; Chaining functions: Thread the result of the first fn into the argument of the next fn (-> (function-a “data”) (function-b ,,,) ;; In Clojure commas , are whitespace (function-c ,,, “data”))
Built-in immutable data structures
Model state and any other data with built-in (hash) maps, vectors (arrays), (linked) lists, (unique) sets
(list 1 2 3 4 5) ‘(“fish” “chips” 42)
(vec ‘(1 2 3 4)) [1 2 3 4]
{:key “value”} {:name “John” :skill “conferencing”}
(set ‘(1 2 3 4 4)) #{1 2 3 4}
Clojure - a few core functions(map fn collection) ;; map a fn over a collection, return new collection(reduce fn collection) ;; return the value of combining elements in collection with fn
(for [x collection] (fn x)) ;; iterate over the elements of a collection
(filter fn collection) ;; return a collection of values that comply with the filter fn
(get {:veg “kale” :fruit “kiwi”} :fruit) ;; return value pointed to by keyword(:fruit {:veg “kale” :fruit “kiwi”}) ;; return value pointed to by keyword
(conj collection value) ;; conjoin a value to the collection(assoc collection coll) ;; add a collection to the collection(update {:a 1} :a fn) ;; update value pointed to by the key in a map with the fn
ClojureScript:Managing complexityA pragmatic approach to purity
The Complexity Iceberg
- @krisajenkins
● complexity is very dangerous when hidden
● You can't know what a function does for certain if it has side effects
Side Effects
Pure FunctionsThe results of the function are purely determined by its initial output and its own code
- no external influence, a function only uses local values- referential transparency (the function can be replaced by its value)
Impure Functions - side causes
Eliminating Side Effects
Functional programming is about eliminating side effects where you can, controlling them where you can't - @krisajenkins
The features in Functional Programming come from a desire to reduce side effects
Design idiom:Composing functions together
You can think of functional design as evaluating one or more functions in series of functions
The Map Reduce Sandwich
Clojure - the Map Reduce Sandwich
Clojure - the Map Reduce Sandwich
Pure Functions & Immutability = ParallelismIn simple terms: run the same code across multiple CPU’s / Threads
Parallelism - pmappmap - the same as map but in parallel
Parallelism - reduceSignificantly lower completion time running in parallel using Immutable data structures
https://github.com/aphyr/tesser
Managing StateState changes should be managed easily
Safe State changes
Changing state safely by changing it atomically
● Software Transactional Memory (STM)○ Gives an mechanism like an in-memory atomic database that manages mutable state changes
under the covers
● Atoms● Refs● core.async
Concurrency syntax - atoms
An online card game has players that can join and have their winnings tracked
Concurrency syntax - atoms
The join-game function adds players to the atom by their name, but only up to 2 players
Concurrency syntax - refsjoin-game-safely adds players to ref & alters their account & game account
ClojureScript - Functional WebImmutability & composable functions for Web Apps
See Clojurescript for Skeptics: https://www.youtube.com/watch?v=gsffg5xxFQI&t=4s
jQuery over all JavaScript frameworks
See Clojurescript for Skeptics: https://www.youtube.com/watch?v=gsffg5xxFQI&t=4s
See Clojurescript for Skeptics: https://www.youtube.com/watch?v=gsffg5xxFQI&t=4s
Google Closure tools & libraries
See Clojurescript for Skeptics: https://www.youtube.com/watch?v=gsffg5xxFQI&t=4s
Examples of Clojurescript
● Goya - pixel editor with undo https://jackschaedler.github.io/goya/
● CircleCI● Style.com● Klipse - web-based dev tool
& library for live-code examples in blogs / workshops
Getting Started with Clojurescript
Clojurescript Environments
Nashorn- built into JVM, access Java classes- Oracle Nashorn: A Next-Generation JavaScript Engine for the JVM
Browser-REPL- built into modern browsers (Chrome, Firefox, etc)- commonly used for client side web apps
Node.js- great for command line utilities and microservices!
Common Clojurescript Tooling
Leiningen- build automation tool for Clojure & Clojurescript
Figwheel (leiningen plugin)- defacto tool for client side web apps- live reload- multi-broadcast (eg simultaneous dev & test outputs)
Full-stack projects: Chestnut
https://github.com/plexus/chestnut- leiningen template for Clojure/ClojureScript apps based- with Om, Reagent, or Rum- instant reloading of Clojure, ClojureScript, and CSS- browser-connected REPL included
lein new chestnut project-name
Self-hosted Clojurescript Environments
Instant startup times, great for command line tools
Lumo (cross-platform)- https://github.com/anmonteiro/lumo
Plank (Mac & Linux)- http://planck-repl.org/
Understanding ReactBasic concepts of React
https://facebook.github.io/react/https://github.com/reactjs
React Basics (conceptual)
React provides an efficient way to update the view
What React Provides
React is only the view
The view should update the state,not the DOM
Reactive FrameworksAll the varieties of life, plus all the Javascript varieties too...
Javascript & Clojurescript frameworks
Javascript
● React.js via cljsjs● Vue.js ???
Clojurescript
● Om / Om-next● Reagent / Reframe● Rum
More at https://clojurescript.org/community/libraries
React.jsUsing React.js within Clojurescript
Simple Calculator with React.js
Reagent
Clojurescript can directly use the React.js library thanks to cljsjs.github.io
React.js
React.js
React.js
React.js
React.js
React.js
Om / Om-nextClojureScript interface to Facebook's React
Om / Om-nextModels the React.js API
Rapidly re-render the UI from the root due via Immutable data structures- UIs are snapshot-able and undoable without implementation complexity
Om supports features not currently present in React:
- Global state management facilities built in- Components may have arbitrary data dependencies, not limited to props & state- Component construction intercepted via :instrument. Simplifies debugging - Stream all application state deltas via :tx-listen. Simplifies on/offline sync- Customizable semantics
Om core functions
om.core/IRender- Render a Om component into the DOM- uses reify to provide a specific implementation of the om/IRender interface
om.core/IInitState- maintains a local state (eg. for managing user input data)
om.core/IRenderState- Render a Om component into the DOM- renders component on change in local & global state
Om core functions
om.dom/div attributes content- creates a <div> tag in react- all react tags need to be wrapped in a div in order to be rendered- om.dom/… has all the other tags too - h1, h2, p, a … (sablono can be used instead)
#js- converts clojure maps into Javascript objects- nest #js functions to to create JS objects - eg. for inline styles
Om Cursors
A cursor is an atom & a path to a location in the atom
app-state :schedule 0
Components use the cursor to refer to pieces of the app state - without knowing where they are in the state tree- updating app state is simple as the cursor is in the correct part of the app state
ReagentInteractive development
Reagent
Reagent provides a minimalistic interface between ClojureScript and React
- define efficient React components using nothing but plain ClojureScript functions and data
- describe your UI using a Hiccup syntax [:div [:h1 “Heading”] [:div [:p “Paragraph” ] [:a {:href “/link.html”} “link text”]]]
- define arbitrarily complex UIs using a couple of basic concepts- fast enough by default that you rarely have to care about performance.
Reagent Core functions
reagent.core/render- Render a Reagent component into the DOM- First argument is either a vector (Reagent Hiccup syntax) or a React element
reagent.core/atom- Like clojure.core/atom, plus it tracks components that deref atom & re-renders them
Helper functions
Reagent used Clojurescript functions for conversion from- Clojure Maps to Javascript Objects - Clojurescript vectors to Javascript arrays
clj->js- convert from Clojurescript to Javascript
js->clj- convert from Javascript to Clojurescript
Reagent Examples
http://timothypratley.blogspot.co.uk/2017/01/reagent-deep-dive-part-1.html
- Uses Klipse to display interactive code snippets for Reagent- Includes use of SVG and Web3D libraries too
Graph example - http://leaderboardx.herokuapp.com/
ReframeA micro-framework for Reagent
Re-frame
a pattern for writing SPAs in ClojureScript, using Reagent.
a framework with pure functions which transform data
Architecturally implements "a perpetual loop".
Build apps by writing pure functions for certain parts of the loop that transform the data - Re-frame looks after the conveyance of data around the loop, into and out of the transforming functions you write - tag line of "Derived Values, Flowing".
RumA micro-framework for Reagent
RumRum is a client/server library for HTML UI. In ClojureScript, it works as React wrapper, in Clojure, it is a static HTML generator.
- Simple semantics: Rum is arguably smaller, simpler and more straightforward than React itself.
- Decomplected: Rum is a library, not a framework. Use only the parts you need, throw away or replace what you don’t need, combine different approaches in a single app, or even combine Rum with other frameworks.
- No enforced state model: Unlike Om, Reagent or Quiescent, Rum does not dictate where to keep your state. Instead, it works well with any storage: persistent data structures, atoms, DataScript, JavaScript objects, localStorage or any custom solution you can think of.
- Extensible: the API is stable and explicitly defined, including the API between Rum internals. It lets you build custom behaviours that change components in significant ways.
- Minimal codebase: You can become a Rum expert just by reading its source code (~900 lines).
Rum - at ClojureX
https://skillsmatter.com/skillscasts/9149-modern-web-apps-with-rum
Other ClojureScript examplesInteractive development
Figwheel (flappy birds example)
Take a journey into Clojurescript
Clojurescript.org & ClojureDocs.org
londonclojurians.org
- 4 events per month- Possibly the most active language-specific
developer communitie in London
Learning by teaching others
I really started thinking in Clojure when I started talking to & teaching others
- Coding dojos- talks on Clojure (starting with the basics, showing the art of the possible)- moving on to running conferences- workshops at hack days
Thank you
@jr0cketjr0cket.co.uk
slideshare.net/jr0cket
You unlock this door with
the key of imagination,
Beyond it is another
dimension
… a dimension of sound
Sound design of a language evolved over many
years
… a dimension of sight
REPL driven development showing you clearly
what your code is doing
… a dimension of mind
Thinking Functionally, of pure functions &
immutability
… of things and ideas
Merging of data structures & behaviour in one
syntax - homoiconicity
You have just crossed over to...
The Clojurescript Zone
The boundaries are only your imagination