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lua-tricks.html
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<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
<title> tricks - quick Lua cheat sheet </title>
<script src="jquery.js"></script>
<script src="jquery-cookie.js"></script>
<script src="jquery-tablesorter.js"></script>
<script src="strftime.js"></script>
<script src="mustache.js"></script>
<script src="config.js"></script>
<script src="main.js"></script>
<link rel="stylesheet" type="text/css" href="templates/reset.css" />
<link rel="stylesheet" type="text/css" href="templates/hack.css" />
<link rel="stylesheet" type="text/css" id="lights_css" />
<script>
var DOCNAME = 'lua-tricks'
var PROJECT = ''
//set the lights before rendering starts
set_lights()
</script>
</head>
<body>
<header>
<div class="container">
<div class="btn-container btn-lights-container">
<a href="#" class="btn btn-lights" id="lights">lights</a>
</div>
<div class="btn-container btn-home-container">
<a href="/" class="btn btn-home">luapower</a>
</div>
<table id="header_table">
<tr>
<td style="vertical-align: middle;" width="100%">
<h1> tricks </h1>
<h2> quick Lua cheat sheet </h2>
</td>
<td style="vertical-align: middle;" align="right" style="height: 150px">
</td>
</tr>
</table>
</div>
</header>
<div class="bg-container">
<div class="bg-center-container">
<div class="bg bg-lua-tricks" style="background-image: url('bg/lua-tricks.png');"></div>
</div>
</div>
<div class="under-header">
<div class="container">
<div id="toc_container" class="toc_container doc"></div>
<button id=tab1_button class="tab_button hidden">Documentation</button>
<button id=tab2_button class="tab_button hidden">Package Info</button>
<div id="tabs_cointainer">
<div id="tab1_container">
<section class="doc">
<span id="module_info"></span>
<blockquote>
<p>Or, unreadable code that you should really turn into helper functions whenever you can.</p>
</blockquote>
<table>
<tbody>
<tr class="odd">
<td align="left"><strong>logic</strong></td>
<td align="left"></td>
</tr>
<tr class="even">
<td align="left"><code>not a == not b</code></td>
<td align="left">both or none</td>
</tr>
<tr class="odd">
<td align="left"><strong>numbers</strong></td>
<td align="left"></td>
</tr>
<tr class="even">
<td align="left">math.min(math.max(x, min), max)</td>
<td align="left">clamp x (upper limit takes precedence)</td>
</tr>
<tr class="odd">
<td align="left"><code>x ~= x</code></td>
<td align="left">number is NaN</td>
</tr>
<tr class="even">
<td align="left"><code>1/0</code></td>
<td align="left">inf</td>
</tr>
<tr class="odd">
<td align="left"><code>-1/0</code></td>
<td align="left">-inf</td>
</tr>
<tr class="even">
<td align="left"><code>math.huge == math.huge-1</code></td>
<td align="left">check if inf is available without dividing by zero</td>
</tr>
<tr class="odd">
<td align="left"><code>x % 1</code></td>
<td align="left">fractional part (always positive)</td>
</tr>
<tr class="even">
<td align="left"><code>x % 1 == 0</code></td>
<td align="left">number is integer; <code>math.floor(x) == x</code></td>
</tr>
<tr class="odd">
<td align="left"><code>x - x % 1</code></td>
<td align="left">integer part; but better use <code>math.floor(x)</code></td>
</tr>
<tr class="even">
<td align="left"><code>x - x % 0.01</code></td>
<td align="left">x floored to two decimal digits</td>
</tr>
<tr class="odd">
<td align="left"><code>x - x % n</code></td>
<td align="left">closest to <code>x</code> smaller than <code>x</code> multiple of <code>n</code></td>
</tr>
<tr class="even">
<td align="left"><code>math.modf(x)</code></td>
<td align="left">integer part and fractional part</td>
</tr>
<tr class="odd">
<td align="left"><code>math.floor(x+.5)</code></td>
<td align="left">round</td>
</tr>
<tr class="even">
<td align="left"><code>(x >= 0 and 1 or -1)</code></td>
<td align="left">sign</td>
</tr>
<tr class="odd">
<td align="left"><code>y0 + (x-x0) * ((y1-y0) / (x1 - x0))</code></td>
<td align="left">linear interpolation</td>
</tr>
<tr class="even">
<td align="left"><code>math.fmod(angle, 2*math.pi)</code></td>
<td align="left">normalize an angle</td>
</tr>
<tr class="odd">
<td align="left"><strong>tables</strong></td>
<td align="left"></td>
</tr>
<tr class="even">
<td align="left"><code>next(t) == nil</code></td>
<td align="left">table is empty</td>
</tr>
<tr class="odd">
<td align="left"><strong>strings</strong></td>
<td align="left"></td>
</tr>
<tr class="even">
<td align="left"><code>s:match'^something'</code></td>
<td align="left">starts with</td>
</tr>
<tr class="odd">
<td align="left"><code>s:match'something$'</code></td>
<td align="left">ends with</td>
</tr>
<tr class="even">
<td align="left"><code>s:match'["\'](.-)%1'</code></td>
<td align="left">match pairs of single or double quotes</td>
</tr>
<tr class="odd">
<td align="left"><strong>i/o</strong></td>
<td align="left"></td>
</tr>
<tr class="even">
<td align="left"><code>f:read(4096, '*l')</code></td>
<td align="left">read lines efficiently</td>
</tr>
</tbody>
</table>
</section>
</div>
<div id="tab2_container" class="doc"></div>
</div>
</div>
<div class="container">
<footer>
<div id="disqus_thread"></div>
<div class="faint">[email protected] | <a href="http://unlicense.org/">public domain</a></div>
</footer>
</div>
</div>
<script type="text/x-mustache" id=info_tab_template>
<h3>Modules</h3>
<ul>
{{#module_array}}
<li>{{name}}</li>
{{/module_array}}
</ul>
</script>
</body>
</html>