Clojure-Script
at first sight
The question
If you like Clojure
will you like ClojureScript?
The road
-
Clojure
-
ClojureScript?
-
ClojureScript! (YMMV)
The family
-
clojure
-
clojure-clr
-
clojurescript
-
clojure-py
-
clojure-scheme
Clojure
-
"clojureness"
-
Many Lines of Code
-
Javaland
Javaland
-
Java language
-
JVM
-
shared code (snippets, jars)
-
mindshare
Alternatives
-
Scala
-
Groovy
-
Jython, JRuby
-
XTend
-
lisps
-
...
"clojureness"
-
dynamic development
-
host interoperability
-
modern lisp
-
concurrent programming
-
runtime polymorphism
Modern Lisp
(clojureness cont'd)
-
first-class functions
-
immutable data structures
-
recursion
-
macro
clojureness in practice
-
compile
-
manage dependencies
-
deploy
-
debug
-
simple made easy?
Clojureland
-
leiningen
-
clojars
-
REPL
-
people
-
batteries
Batteries
-
Included:
set, walk, ...
-
Excluded:
json, logic, xml, ...
-
Libraries: compojure, ring, enlive, ...
-
Projects: overtone, incanter, ...
ClojureScript
-
"clojureness"
-
More Lines of Code
-
JavaScriptLand
JavaScriptLand?
module greeting;
var name = readLine();
if (name == null) {
console.log("Hello, world");
}
else {
console.log("Hello, " + name);
}
JavaScriptLand!
-
browsers
-
server-side engines
-
common.js
-
de facto libraries
More Lines of Code
-
Read-emit in Clojure
-
Closure compiler in Java
-
cljs.core library
-
Google Closure Library
Alternatives
-
Dart, TypeScript,
Adobe AIR
-
CoffeeScript, ...
-
Haxe, Fantom, ...
-
language ports
Alternatives
with some clojureness
-
lisps and schemes
-
chlorinejs
-
kanaka/clojurescript
-
mori
-
wisp
Clojure vs Coffe
-
- heavy-weight
-
- slow compilation
-
- debugging
-
+ persistent data structures
-
+ no javascript bad parts
-
± ecosystem
differences
(ns foo.bar
(:use
[foo.helper :only [baz]])
(:require
[clojure.set :as set])
(:use-macro
[foo.macros :only [debug]]))
Missing
-
ns-resolve and friends
-
rationalize, bigint, and friends
-
*out*, print
-
some core libraries (pprint, test, xml)
Interop Differences
(defn ^:export show-off
"It will be show_off"
[& args]
(let [[head tail] (js->clj args)]
(.log js/console "Before greeting")
(set! (.-title js/document) "Hi!")))
Decisions to make
-
Node.js/npm or browser or ...
-
Development workflow
-
Shared code or js only
-
Macros
Step One
lein new cljs-kickoff step-one
cd step-one
lein cljsbuild auto &
lein ring server
cljsbuild
(defproject step-three "0.0.3"
:source-paths ["src/clj" "src/common"]
:test-paths ["test/clj"]
:repl-options {:port 40444}
:cljsbuild
{:builds
[{:source-paths ["src/cljs" "src/common"]
:compiler
{:pretty-print true
:output-to "gen/generated.js"
:optimizations :whitespace}}]
:crossover-path "target/crossover"
:crossovers ["foo.bar"]})
Node.js
-
node target in cljsbuild
-
bodil/cljs-noderepl
-
node-clojurescript (dead?)
Shared code
-
none
-
cljsbuild crossovers
-
cljx
-
feature expressions (someday)
The Answer
I hate this answer.
Do I like ClojureScript?
Well, it depends.
Do you?