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Smooth CoffeeScript.lyx
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Smooth CoffeeScript.lyx
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\begin_layout Title
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Smooth CoffeeScript
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\family sans
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E.
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\end_inset
Hoigaard
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\begin_layout Publishers
\size large
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LatexCommand href
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\begin_layout Dedication
\size normal
An introduction to CoffeeScript programming with
\begin_inset Newline newline
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an emphasis on clarity, abstraction and verification.
\size large
\begin_inset Newline newline
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The book is
\begin_inset CommandInset href
LatexCommand href
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target "http://creativecommons.org/licenses/by/3.0/"
\end_inset
available, and may be used (as a whole or in parts)
\begin_inset Newline newline
\end_inset
in any way you see fit, as long as credit is given to the original author.
\begin_inset Newline newline
\end_inset
\begin_inset CommandInset href
LatexCommand href
name "Based on Eloquent JavaScript by Marijn Haverbeke"
target "http://eloquentjavascript.net/"
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.
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Typeset in LyX / XeTeX with
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.
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1
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\begin_layout Plain Layout
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st
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edition, 3
\begin_inset script superscript
\begin_layout Plain Layout
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rd
\end_layout
\end_inset
revision & illustrations © 2554
\begin_inset CommandInset href
LatexCommand href
name "BE"
target "http://www.accesstoinsight.org/history.html#fn-1"
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/ 2011
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target "http://www.accesstoinsight.org/history.html#fn-2"
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.
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.
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\begin_layout Part
Preface
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Foreword
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status collapsed
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Foreword
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\end_inset
\begin_inset CommandInset label
LatexCommand label
name "chap:Foreword"
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\begin_layout Standard
Coffee\SpecialChar \-
Script is a lucid evolution of Java\SpecialChar \-
Script created by Jeremy Ashkenas.
This book attempts to be an evolution of
\begin_inset Quotes eld
\end_inset
Eloquent Java\SpecialChar \-
Script
\begin_inset Quotes erd
\end_inset
by Marijn Haverbeke.
Apart from the major change in explaining Coffee\SpecialChar \-
Script instead of Java\SpecialChar \-
Script,
numerous other changes have been made and sections have been added, edited
or removed.
\end_layout
\begin_layout Standard
Everything that is expressed in this book is therefore solely the responsibility
of the editor.
In the sense of open source software, this book is a
\begin_inset CommandInset href
LatexCommand href
name "fork"
target "http://en.wikipedia.org/wiki/Fork_(software_development)"
\end_inset
.
To read the excellent original Java\SpecialChar \-
Script work as it was intended by its
author refer to
\begin_inset CommandInset href
LatexCommand href
name "Eloquent JavaScript by Marijn Haverbeke"
target "http://eloquentjavascript.net/"
\end_inset
.
\end_layout
\begin_layout Standard
You do not need to know Java\SpecialChar \-
Script but after reading
\family sans
Smooth Coffee\SpecialChar \-
Script
\family default
you can in
\begin_inset CommandInset href
LatexCommand href
name "JavaScript Basics"
target "http://autotelicum.github.com/Smooth-CoffeeScript/literate/js-intro.html"
\end_inset
by Rebecca Murphey find an overview that can be helpful when debugging
or using Java\SpecialChar \-
Script libraries.
\end_layout
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\paragraph_spacing other 0.5
\noindent
\align center
\begin_inset Formula $\circ\bullet\circ$
\end_inset
\end_layout
\begin_layout Standard
The program examples in this book use a prelude file in addition to the
Coffee\SpecialChar \-
Script environment.
It includes the Underscore functional library, the Coffeekup
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HTML
\shape default
\size default
markup,
\family typewriter
ws
\family default
server-side WebSockets and
\family typewriter
qc
\family default
, a Quick\SpecialChar \-
Check based testing library.
These libraries extend Coffee\SpecialChar \-
Script with useful abstractions and testing
tools to keep focus on the task at hand instead of distracting boilerplate
code.
\end_layout
\begin_layout Standard
While it is possible to express programs from a very small set of language
primitives, it quickly becomes tedious and error prone to do so.
The approach taken here is to include a broader set of functional building
blocks as if they were a native part of the programming language.
By thinking in terms of these higher level constructs more complex problems
can be handled with less effort.
\end_layout
\begin_layout Standard
To ensure correctness testing is required.
This is especially true when developing reusable algorithms in a dynamic
and untyped language.
By integrating Quick\SpecialChar \-
Check style test cases as soon as functions are introduced,
it is intended that writing tests and declaring assumptions become a seamless
part of writing software.
\end_layout
\begin_layout Standard
\begin_inset Newpage clearpage
\end_inset
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\begin_layout Standard
Coffee\SpecialChar \-
Script is available in browsers and environments where Java\SpecialChar \-
Script
is available.
The screenshots below show Coffee\SpecialChar \-
Script running the same web server and
client application on Mac OS X, Windows and iOS.
\end_layout
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\noindent
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\begin_layout Standard
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\noindent
\align center
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lyxscale 40
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\begin_layout Standard
The Coffee\SpecialChar \-
Script below shows the brevity of the self-contained application
from the screenshots.
It contains an
\shape smallcaps
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HTML
\shape default
\size default
5 web page in Coffeekup markup and its own
\shape smallcaps
\size small
HTTP
\shape default
\size default
web server.
The page has a Canvas element with a drawing of the
\begin_inset Quotes els
\end_inset
Seed of Life
\begin_inset Quotes ers
\end_inset
.
Coffeekup is a few hundred lines of Coffee\SpecialChar \-
Script.
No frameworks.
No JavaScript.
Pure and smooth.
\end_layout
\begin_layout Standard
\begin_inset listings
lstparams "basicstyle={\footnotesize\ttfamily},tabsize=2"
inline false
status open
\begin_layout Plain Layout
require './prelude'
\end_layout
\begin_layout Plain Layout
\end_layout
\begin_layout Plain Layout
webpage = kup.render ->
\end_layout
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doctype 5
\end_layout
\begin_layout Plain Layout
html ->
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\begin_layout Plain Layout
head ->
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meta charset: 'utf-8'
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style '''
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header, nav, section, footer {display: block}
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'''
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\begin_layout Plain Layout
coffeescript ->
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draw = (ctx, x, y) ->
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circle = (ctx, x, y) ->
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ctx.stroke()
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circle ctx, x, y
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for angle in [0...2*Math.PI] by 1/3*Math.PI
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circle ctx, x+100*Math.cos(angle),
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y+100*Math.sin(angle)
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window.onload = ->
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canvas = document.getElementById 'drawCanvas'
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context = canvas.getContext '2d'
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draw context, 300, 200
\end_layout
\begin_layout Plain Layout
body ->
\end_layout
\begin_layout Plain Layout
header -> h1 'Seed of Life'
\end_layout
\begin_layout Plain Layout
canvas id: 'drawCanvas', width: 600, height: 400
\end_layout
\begin_layout Plain Layout
\end_layout
\begin_layout Plain Layout
http = require 'http'
\end_layout
\begin_layout Plain Layout
server = http.createServer (req, res) ->
\end_layout
\begin_layout Plain Layout
show "#{req.client.remoteAddress} #{req.method} #{req.url}"
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res.writeHead 200, 'Content-Type': 'text/html'
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res.write webpage
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res.end()
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server.listen 3389
\end_layout
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show 'Server running at'
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show server.address()
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\end_inset
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\begin_layout Chapter
Software
\end_layout
\begin_layout Standard
\family sans
Smooth Coffee\SpecialChar \-
Script
\family default
is about the Coffee\SpecialChar \-
Script language, see
\begin_inset CommandInset href
LatexCommand href
name "Quick CoffeeScript Install"
target "http://autotelicum.github.com/Smooth-CoffeeScript/literate/install-notes.html"
\end_inset
or refer to the websites for further installation information.
This should get you started:
\end_layout
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\begin_inset VSpace medskip
\end_inset
\end_layout
\begin_layout Itemize
The Coffee\SpecialChar \-
Script language (1.1.3 / MIT) from
\begin_inset CommandInset href
LatexCommand href
name "Jeremy Ashkenas"
target "http://www.coffeescript.org"
\end_inset
\end_layout
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The Underscore library (1.1.0.FIX / MIT) included in
\begin_inset CommandInset href
LatexCommand href
name "CoffeeScript"
target "http://jashkenas.github.com/coffee-script/documentation/docs/underscore.html"
\end_inset
\end_layout
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The Coffeekup library (0.3.1 / MIT) from
\begin_inset CommandInset href
LatexCommand href
name "Maurice Machado"
target "http://coffeekup.org/"
\end_inset
\end_layout
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Translated
\family typewriter
ws
\family default
WebSockets (MIT) from
\begin_inset CommandInset href
LatexCommand href
name "Jacek Becela"
target "https:/ncr/node.ws.js"
\end_inset
\end_layout
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The
\family typewriter
qc
\family default
testing library
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status collapsed
\begin_layout Plain Layout
This library is only used to test functionality.
The Coffee\SpecialChar \-
Script applications in
\family sans
Smooth Coffee\SpecialChar \-
Script
\family default
do not depend on it.
Coffee\SpecialChar \-
Script is a new language and tools like
\family typewriter
qc
\family default
depend on legacy code written in JavaScript.
\end_layout
\end_inset
(2009 / BSD) from
\begin_inset CommandInset href
LatexCommand href
name "Darrin Thompson"
target "https://bitbucket.org/darrint/qc.js/"
\end_inset
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\begin_layout Standard
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\end_inset
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\begin_layout Standard
The required libraries have been adapted for standard Coffee\SpecialChar \-
Script and are
included in the
\begin_inset listings
lstparams "language=bash"
inline true
status open
\begin_layout Plain Layout
src/prelude
\end_layout
\end_inset
directory.
Underscore,
\family typewriter
ws
\family default
and Coffeekup are written in Coffee\SpecialChar \-
Script and they are small enough to
read and understand in a short time — at least after you have read this
book.
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\paragraph_spacing other 0.5
\noindent
\align center
\begin_inset Formula $\circ\bullet\circ$
\end_inset
\end_layout
\begin_layout Standard
To set up your own working environment follow the steps described
\begin_inset CommandInset href
LatexCommand href
name "here"
target "http://autotelicum.github.com/Smooth-CoffeeScript/literate/install-notes.html"
\end_inset
or at
\begin_inset CommandInset href
LatexCommand href
name "coffeescript.org"
target "http://jashkenas.github.com/coffee-script/#installation"
\end_inset
\begin_inset Foot
status collapsed
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The CoffeeScript examples have been tested on Mac OS X 10.6 and on Windows
7 with the prebuilt node installers.
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\end_inset
.
If you use Windows then you can adapt the prelude to default to your preferred
web browser.
You can also find instructions there for how to enable WebSockets if your
browser requires it.
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\begin_layout Standard
Then set up your text editor to support Coffee\SpecialChar \-
Script, you can find several
on the
\begin_inset CommandInset href
LatexCommand href
name "CoffeeScript wiki"
target "https:/jashkenas/coffee-script/wiki/Text-editor-plugins"
\end_inset
.
For example to use the
\begin_inset CommandInset href
LatexCommand href
name "TextMate bundle"
target "https:/jashkenas/coffee-script-tmbundle"
\end_inset
with the cross-platform
\begin_inset CommandInset href
LatexCommand href
name "Sublime Text 2 editor"
target "http://www.sublimetext.com/2"
\end_inset
, unpack the bundle in a Coffee\SpecialChar \-
Script directory under Packages.
This setup gives you syntax highlighting, code snippets, and code completion.
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\begin_layout Standard
You can add a build file to get execution of Coffee\SpecialChar \-
Script with the press
of a button.
Name the file CoffeeScript.sublime-build and change the path according to
you operating system and install location.
Something like:
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\begin_layout Standard
\begin_inset listings
lstparams "language=XML,showstringspaces=false"
inline false
status open
\begin_layout Plain Layout