<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Style-Type" content="text/css" /> <meta name="generator" content="pandoc" /> <title></title> <style type="text/css"> table.sourceCode, tr.sourceCode, td.lineNumbers, td.sourceCode { margin: 0; padding: 0; vertical-align: baseline; border: none; } table.sourceCode { width: 100%; } td.lineNumbers { text-align: right; padding-right: 4px; padding-left: 4px; color: #aaaaaa; border-right: 1px solid #aaaaaa; } td.sourceCode { padding-left: 5px; } code > span.kw { color: #007020; font-weight: bold; } code > span.dt { color: #902000; } code > span.dv { color: #40a070; } code > span.bn { color: #40a070; } code > span.fl { color: #40a070; } code > span.ch { color: #4070a0; } code > span.st { color: #4070a0; } code > span.co { color: #60a0b0; font-style: italic; } code > span.ot { color: #007020; } code > span.al { color: #ff0000; font-weight: bold; } code > span.fu { color: #06287e; } code > span.er { color: #ff0000; font-weight: bold; } </style> </head> <body> <h1 id="lhs-test">lhs test</h1> <p><code>unsplit</code> is an arrow that takes a pair of values and combines them to return a single value:</p> <pre class="sourceCode literate haskell"><code class="sourceCode haskell"><span class="fu">></span><span class="ot"> unsplit ::</span> (<span class="dt">Arrow</span> a) <span class="ot">=></span> (b <span class="ot">-></span> c <span class="ot">-></span> d) <span class="ot">-></span> a (b, c) d <span class="fu">></span> unsplit <span class="fu">=</span> arr <span class="fu">.</span> <span class="fu">uncurry</span> <span class="fu">></span> <span class="co">-- arr (\op (x,y) -> x `op` y) </span></code></pre> <p><code>(***)</code> combines two arrows into a new arrow by running the two arrows on a pair of values (one arrow on the first item of the pair and one arrow on the second item of the pair).</p> <pre><code>f *** g = first f >>> second g</code></pre> <p>Block quote:</p> <blockquote> <p>foo bar</p> </blockquote> </body> </html>