473 lines
26 KiB
HTML
473 lines
26 KiB
HTML
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<div class="row">
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<div class="ten columns centered center-text">
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<h4>Unique Lines</h4>
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<pre style="font-size: 140%; font-family: 'Inconsolata';">
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#lang <a href="http://docs.racket-lang.org/reference/index.html" class="codemodpath" rel="nofollow">racket</a>
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<span class="codecomment">;; Report each unique line from stdin</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/let.html#(form._((lib._racket/private/letstx-scheme..rkt)._let))" class="codelinkimportform" rel="nofollow">let</a> <span class="codeparenthesis">(</span><span class="codeparenthesis">[</span><span class="codeid">saw</span> <span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/hashtables.html#(def._((quote._~23~25kernel)._make-hash))" class="codelinkimportid" rel="nofollow">make-hash</a><span class="codeparenthesis">)</span><span class="codeparenthesis">]</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/for.html#(form._((lib._racket/private/base..rkt)._for))" class="codelinkimportform" rel="nofollow">for</a> <span class="codeparenthesis">(</span><span class="codeparenthesis">[</span><span class="codeid">line</span> <span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/sequences.html#(def._((lib._racket/private/base..rkt)._in-lines))" class="codelinkimportid" rel="nofollow">in-lines</a><span class="codeparenthesis">)</span><span class="codeparenthesis">]</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/when_unless.html#(form._((lib._racket/private/letstx-scheme..rkt)._unless))" class="codelinkimportform" rel="nofollow">unless</a> <span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/hashtables.html#(def._((quote._~23~25kernel)._hash-ref))" class="codelinkimportid" rel="nofollow">hash-ref</a> <span class="codeid">saw</span> <span class="codeid">line</span> <span class="codeconstant">#f</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/Writing.html#(def._((lib._racket/private/misc..rkt)._displayln))" class="codelinkimportid" rel="nofollow">displayln</a> <span class="codeid">line</span><span class="codeparenthesis">)</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/hashtables.html#(def._((quote._~23~25kernel)._hash-set!))"
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class="codelinkimportid"
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rel="nofollow">hash-set!</a> <span class="codeid">saw</span> <span class="codeid">line</span> <span class="codeconstant">#t</span><span class="codeparenthesis">)</span><span class="codeparenthesis">)</span><span class="codeparenthesis">)</span>
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</pre>
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</div>
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</div>
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<div class="row">
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<div class="ten columns centered center-text">
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<p>
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Uses a hash table to record previously seen lines. You can run this program in DrRacket, but it makes more sense from the command line.
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</p>
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<p>
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To run the example, install Racket, start DrRacket, paste the example
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program into the top area in DrRacket, and click the Run
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button. Alternatively, save the program to a file and run <code>racket</code> on
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the file.
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</p>
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<p style="font-size: 80%">
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Form and function names in the code are hyperlinked to
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documentation, so click on them for more information.
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</p>
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</div>
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</div>
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</div>
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<div class="content echo_server codesnip">
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<a class="close switch" gumby-trigger="|#modal1"><i class="icon-cancel" /></i></a>
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<div class="row">
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<div class="ten columns centered center-text">
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<h4>Echo server</h4>
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<pre style="font-size: 140%; font-family: 'Inconsolata';">
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#lang <a href="http://docs.racket-lang.org/reference/index.html" class="codemodpath" rel="nofollow">racket</a> <span class="codecomment">; An echo server</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/define.html#(form._((lib._racket/private/base..rkt)._define))" class="codelinkimportform" rel="nofollow">define</a> <span class="codeid">listener</span> <span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/tcp.html#(def._((lib._racket/tcp..rkt)._tcp-listen))" class="codelinkimportid" rel="nofollow">tcp-listen</a> <span class="codeconstant">12345</span><span class="codeparenthesis">)</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/let.html#(form._((lib._racket/private/letstx-scheme..rkt)._let))" class="codelinkimportform" rel="nofollow">let</a> <span class="codeid">echo-server</span> <span class="codeparenthesis">(</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/define.html#(form._((quote._~23~25kernel)._define-values))" class="codelinkimportform" rel="nofollow">define-values</a> <span class="codeparenthesis">(</span><span class="codeid">in</span> <span class="codeid">out</span><span class="codeparenthesis">)</span> <span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/tcp.html#(def._((lib._racket/tcp..rkt)._tcp-accept))" class="codelinkimportid" rel="nofollow">tcp-accept</a> <span class="codeid">listener</span><span class="codeparenthesis">)</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/threads.html#(def._((quote._~23~25kernel)._thread))" class="codelinkimportid" rel="nofollow">thread</a> <span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/lambda.html#(form._((lib._racket/private/base..rkt)._lambda))" class="codelinkimportform" rel="nofollow">lambda</a> <span class="codeparenthesis">(</span><span class="codeparenthesis">)</span> <span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/port-lib.html#(def._((lib._racket/port..rkt)._copy-port))" class="codelinkimportid" rel="nofollow">copy-port</a> <span class="codeid">in</span> <span class="codeid">out</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/port-ops.html#(def._((quote._~23~25kernel)._close-output-port))" class="codelinkimportid" rel="nofollow">close-output-port</a> <span class="codeid">out</span><span class="codeparenthesis">)</span><span class="codeparenthesis">)</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><span class="codeid">echo-server</span><span class="codeparenthesis">)</span><span class="codeparenthesis">)</span>
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</pre>
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</div>
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</div>
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<div class="row">
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<div class="ten columns centered center-text">
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<p>
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Racket makes it easy to use TCP sockets and spawn threads to handle
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them. This program starts a server at TCP port 12345 that echos
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anything a client sends back to the client.</p>
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<p>
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To run the example, install Racket, start DrRacket, paste the example
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program into the top area in DrRacket, and click the Run
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button. Alternatively, save the program to a file and run <code>racket</code> on
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the file.
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</p>
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<p class="footnote" style="font-size: 80%">
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Form and function names in the code are hyperlinked to
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documentation, so click on them for more information.
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</p>
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</div>
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</div>
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</div>
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</div>
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<div class="row" >
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<div class="ten columns centered">
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<h2 style="font-size: 180%; margin-bottom:
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10pt"><strong>Racket</strong>: A programmable programming
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language</h2>
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</div></div>
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<div class="row" >
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<div class="nine columns centered" style="margin-bottom: 10pt; font-size: 120%; text-align:justify;">
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Racket is a wide-spectrum programming language that inherits from Lisp
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and Scheme but also provides dialects that support
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objects, types, laziness and many other
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paradigms. Racket's module system allows programmers to
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write components in different dialects and link them
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together. Racket's libraries extend from web servers to
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databases to distributed computing to charting.
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</div>
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</div>
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<div class="row" >
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<div class="ten columns centered"><h2 style="font-size: 180%;
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margin-bottom:
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10pt"></>Start
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Quickly</h2></div>
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</div>
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<!-- The other version of the buttons: -->
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<div id="topcontent">
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<div class="row">
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<section class="twelve columns centered">
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<article class="valign row">
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<div class="one columns push_one">
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<a href="#" class="toggle"
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gumby-trigger=".unique_lines|.echo_server">
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<img src="img/prev.png" style="margin-top: 50px; width: 50px">
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</a>
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</div>
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<div class="eight columns" style="position:relative; font-size: 140%; font-family: 'Inconsolata';">
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<p class="metro primary btn"
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style="position: absolute; top: -10%; right: 0%;" >
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<a href="#" class="switch" gumby-trigger="#modal1"> <i class="icon-help"></i></a>
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</p>
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<pre class="codesnip active unique_lines">
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#lang <a href="http://docs.racket-lang.org/reference/index.html" class="codemodpath" rel="nofollow">racket</a>
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<span class="codecomment">;; Report each unique line from stdin</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/let.html#(form._((lib._racket/private/letstx-scheme..rkt)._let))" class="codelinkimportform" rel="nofollow">let</a> <span class="codeparenthesis">(</span><span class="codeparenthesis">[</span><span class="codeid">saw</span> <span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/hashtables.html#(def._((quote._~23~25kernel)._make-hash))" class="codelinkimportid" rel="nofollow">make-hash</a><span class="codeparenthesis">)</span><span class="codeparenthesis">]</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/for.html#(form._((lib._racket/private/base..rkt)._for))" class="codelinkimportform" rel="nofollow">for</a> <span class="codeparenthesis">(</span><span class="codeparenthesis">[</span><span class="codeid">line</span> <span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/sequences.html#(def._((lib._racket/private/base..rkt)._in-lines))" class="codelinkimportid" rel="nofollow">in-lines</a><span class="codeparenthesis">)</span><span class="codeparenthesis">]</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/when_unless.html#(form._((lib._racket/private/letstx-scheme..rkt)._unless))" class="codelinkimportform" rel="nofollow">unless</a> <span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/hashtables.html#(def._((quote._~23~25kernel)._hash-ref))" class="codelinkimportid" rel="nofollow">hash-ref</a> <span class="codeid">saw</span> <span class="codeid">line</span> <span class="codeconstant">#f</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/Writing.html#(def._((lib._racket/private/misc..rkt)._displayln))" class="codelinkimportid" rel="nofollow">displayln</a> <span class="codeid">line</span><span class="codeparenthesis">)</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/hashtables.html#(def._((quote._~23~25kernel)._hash-set!))"
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class="codelinkimportid"
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rel="nofollow">hash-set!</a> <span class="codeid">saw</span> <span class="codeid">line</span> <span class="codeconstant">#t</span><span class="codeparenthesis">)</span><span class="codeparenthesis">)</span><span class="codeparenthesis">)</span>
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</pre>
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<pre class="codesnip echo_server">
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#lang <a href="http://docs.racket-lang.org/reference/index.html" class="codemodpath" rel="nofollow">racket</a> <span class="codecomment">; An echo server</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/define.html#(form._((lib._racket/private/base..rkt)._define))" class="codelinkimportform" rel="nofollow">define</a> <span class="codeid">listener</span> <span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/tcp.html#(def._((lib._racket/tcp..rkt)._tcp-listen))" class="codelinkimportid" rel="nofollow">tcp-listen</a> <span class="codeconstant">12345</span><span class="codeparenthesis">)</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/let.html#(form._((lib._racket/private/letstx-scheme..rkt)._let))" class="codelinkimportform" rel="nofollow">let</a> <span class="codeid">echo-server</span> <span class="codeparenthesis">(</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/define.html#(form._((quote._~23~25kernel)._define-values))" class="codelinkimportform" rel="nofollow">define-values</a> <span class="codeparenthesis">(</span><span class="codeid">in</span> <span class="codeid">out</span><span class="codeparenthesis">)</span> <span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/tcp.html#(def._((lib._racket/tcp..rkt)._tcp-accept))" class="codelinkimportid" rel="nofollow">tcp-accept</a> <span class="codeid">listener</span><span class="codeparenthesis">)</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/threads.html#(def._((quote._~23~25kernel)._thread))" class="codelinkimportid" rel="nofollow">thread</a> <span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/lambda.html#(form._((lib._racket/private/base..rkt)._lambda))" class="codelinkimportform" rel="nofollow">lambda</a> <span class="codeparenthesis">(</span><span class="codeparenthesis">)</span> <span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/port-lib.html#(def._((lib._racket/port..rkt)._copy-port))" class="codelinkimportid" rel="nofollow">copy-port</a> <span class="codeid">in</span> <span class="codeid">out</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><a href="http://docs.racket-lang.org/reference/port-ops.html#(def._((quote._~23~25kernel)._close-output-port))" class="codelinkimportid" rel="nofollow">close-output-port</a> <span class="codeid">out</span><span class="codeparenthesis">)</span><span class="codeparenthesis">)</span><span class="codeparenthesis">)</span>
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<span class="codeparenthesis">(</span><span class="codeid">echo-server</span><span class="codeparenthesis">)</span><span class="codeparenthesis">)</span>
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</pre>
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</div>
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<div class="one columns">
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<a href="#" class="toggle" gumby-trigger=".unique_lines|.echo_server">
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<img src="img/next.png" style="width: 50px; margin-top: 50px;">
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</a>
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</div>
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</article>
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</section>
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</div>
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<div class="row">
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<p class="ten columns centered" style="font-size: 120%; margin-top: 10pt; ">
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<a href="http://docs.racket-lang.org/quick/">Draw more pictures</a> or
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<a href="http://docs.racket-lang.org/more/">build a web server from scratch</a>. Racket includes both
|
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<a href="http://docs.racket-lang.org/">batteries</a> and a <a href="http://docs.racket-lang.org/drracket/">programming environment</a>,
|
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so <a href="http://docs.racket-lang.org/getting-started/">get started</a>!
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</p>
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</div>
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</div>
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<!-- below code snippets -->
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<div class="row">
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<div class="ten columns centered">
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<h3 >Go Further</h3>
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</div>
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</div>
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<div class="row" id="growboxes">
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<div class="four columns">
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<div class="panetitle">Grow your Program</div><p>Racket's
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<a href="http://docs.racket-lang.org/guide/intro.html#(part._.Interacting_with_.Racket)">interactive mode</a>
|
|
encourages experimentation, and quick scripts easily compose into
|
|
larger systems. Small scripts and large systems both benefit from
|
|
<a href="http://docs.racket-lang.org/guide/performance.html">native-code JIT compilation</a>.
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When a system gets too big to keep in your head, you can add
|
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<a href="http://docs.racket-lang.org/ts-guide/index.html">static types</a>.</p>
|
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</div>
|
|
|
|
<div class="four columns">
|
|
<div class="panetitle">Grow your Language</div><p><a href="http://docs.racket-lang.org/guide/languages.html">Extend Racket</a> whenever you need to.
|
|
Mold it to better suit your tasks without sacrificing
|
|
<a href="http://docs.racket-lang.org/guide/dialects.html">interoperability</a> with existing
|
|
libraries and without having to modify the
|
|
<a href="http://docs.racket-lang.org/guide/intro.html">tool chain</a>. When less is more, you can
|
|
remove parts of a language or start over and build a new one.</p>
|
|
</div>
|
|
|
|
<div class="four columns">
|
|
|
|
<div class="panetitle">Grow your Skills</div><p>Whether you're just <a href="http://htdp.org/">starting out</a>, want to know more about
|
|
programming language <a href="http://www.plai.org/">applications</a> or <a href="http://redex.racket-lang.org/">models</a>,
|
|
looking to <a href="http://docs.racket-lang.org/continue/">expand your horizons</a>, or ready to dive into
|
|
<a href="learning.html">research</a>, Racket can help you become a better programmer
|
|
and system builder.</p>
|
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</div>
|
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</div>
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</div>
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<div class="row">
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<div class="ten columns centered">
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<h3 >Documentation</h3>
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</div>
|
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</div>
|
|
|
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<div class=row>
|
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<div class="five columns">
|
|
<div class="panetitle">For getting started</div>
|
|
<div class="parlistitem"><a href="http://docs.racket-lang.org/quick/"><strong>Quick</strong>:
|
|
An Introduction to Racket with
|
|
Pictures</a>
|
|
gives you a taste of Racket.
|
|
</div>
|
|
|
|
<div class="parlistitem"><a href="http://docs.racket-lang.org/more/"><strong>More</strong>:
|
|
Systems Programming with Racket</a>
|
|
dives
|
|
much deeper and much faster, showing how to build a complete
|
|
continuation-based web server.</div>
|
|
|
|
<div class="parlistitem"><a href="http://docs.racket-lang.org/guide/"><strong>Guide</strong>:
|
|
Racket</a> starts with a tutorial on Racket basics, and then it
|
|
describes the rest of the Racket language.</div>
|
|
</div>
|
|
<div class="five columns push_two">
|
|
<div class="panetitle">For experienced Racketeers</div>
|
|
<div class="parlistitem">
|
|
<a href="http://docs.racket-lang.org/reference/"><strong>Reference</strong>:
|
|
Racket</a> provides comprehensive coverage of all of Racket.
|
|
</div>
|
|
|
|
<div class="parlistitem"><a href="http://docs.racket-lang.org/continue/"><strong>Continue</strong>:
|
|
Web Applications in Racket</a>
|
|
describes how to use the
|
|
Racket <a href="http://docs.racket-lang.org/web-server/">web
|
|
server</a> to build dynamic web applications.
|
|
</div>
|
|
|
|
<div class="parlistitem"><a href="http://docs.racket-lang.org/pkg/"><strong>Package
|
|
Management</strong></a> explains how to install
|
|
<a href="https://pkg.racket-lang.org">packages</a>, and how to
|
|
build and distribute your own.</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
<div class="row">
|
|
<div class="ten columns centered">
|
|
<h3>Community</h3>
|
|
</div>
|
|
</div>
|
|
|
|
<div class=row>
|
|
|
|
|
|
<div class="four columns">
|
|
<div class="panetitle">News</div>
|
|
<p><a href="http://blog.racket-lang.org/">Blog</a>
|
|
— announcements, helpful hints, and thoughtful rants.</p>
|
|
<p><a href="http://twitter.com/#!/racketlang">Twitter</a>
|
|
— short bits of Racket news.</p>
|
|
</div>
|
|
|
|
<div class="four columns">
|
|
<div class="panetitle">Discussion</div>
|
|
<p><a href="http://lists.racket-lang.org/">Mailing lists</a>
|
|
— discussion for using and developing Racket.</p>
|
|
<p><a href="http://racket-lang.org/irc-chat.html">IRC</a> —
|
|
Chat in the <tt style="background-color: #d8d8e8;"><big><strong>#racket</strong></big></tt> channel on
|
|
<a href="http://freenode.net"><tt>freenode.net</tt></a> — an informal
|
|
discussion channel for all things related to Racket.
|
|
(<a href="https://botbot.me/freenode/racket/">Browse the logs</a>.)</p>
|
|
</div>
|
|
|
|
<div class="four columns">
|
|
<div class="panetitle">Contributing</div>
|
|
<p><a href="https://github.com/plt/racket/">Code</a>
|
|
— the Racket source code on GitHub.</p>
|
|
<p><a href="https://github.com/plt/racket/wiki">Wiki</a> —
|
|
Useful pages
|
|
include <a href="https://github.com/plt/racket/wiki/Intro-Projects">Intro
|
|
Projects</a>
|
|
and <a href="https://github.com/plt/racket/wiki/Videos">Videos</a>,
|
|
including tutorials, interviews, and more.</p>
|
|
<p><a href="http://www.cs.utah.edu/plt/snapshots">Snapshot builds</a> —
|
|
The freshest versions of Racket.</p>
|
|
|
|
<p><a href="http://bugs.racket-lang.org">Bug reports</a> —
|
|
File, query and maybe fix existing reports.</p>
|
|
|
|
</div>
|
|
|
|
</div>
|
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|
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