File: pl.comprehension.html

package info (click to toggle)
lua-penlight 1.14.0-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 2,708 kB
  • sloc: makefile: 2
file content (165 lines) | stat: -rw-r--r-- 9,061 bytes parent folder | download | duplicates (2) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<head>
    <title>Penlight Documentation</title>
    <link rel="stylesheet" href="../ldoc_fixed.css" type="text/css" />
</head>
<body>

<div id="container">

<div id="product">
	<div id="product_logo"></div>
	<div id="product_name"><big><b></b></big></div>
	<div id="product_description"></div>
</div> <!-- id="product" -->


<div id="main">


<!-- Menu -->

<div id="navigation">
<br/>
<h1>Penlight</h1>

<ul>
  <li><a href="https://github.com/lunarmodules/Penlight">GitHub Project</a></li>
  <li><a href="../index.html">Documentation</a></li>
</ul>



<h2>Libraries</h2>
<ul class="nowrap">
  <li><a href="../libraries/pl.html">pl</a></li>
  <li><a href="../libraries/pl.app.html">pl.app</a></li>
  <li><a href="../libraries/pl.array2d.html">pl.array2d</a></li>
  <li><a href="../libraries/pl.class.html">pl.class</a></li>
  <li><a href="../libraries/pl.compat.html">pl.compat</a></li>
  <li><strong>pl.comprehension</strong></li>
  <li><a href="../libraries/pl.config.html">pl.config</a></li>
  <li><a href="../libraries/pl.data.html">pl.data</a></li>
  <li><a href="../libraries/pl.dir.html">pl.dir</a></li>
  <li><a href="../libraries/pl.file.html">pl.file</a></li>
  <li><a href="../libraries/pl.func.html">pl.func</a></li>
  <li><a href="../libraries/pl.import_into.html">pl.import_into</a></li>
  <li><a href="../libraries/pl.input.html">pl.input</a></li>
  <li><a href="../libraries/pl.lapp.html">pl.lapp</a></li>
  <li><a href="../libraries/pl.lexer.html">pl.lexer</a></li>
  <li><a href="../libraries/pl.luabalanced.html">pl.luabalanced</a></li>
  <li><a href="../libraries/pl.operator.html">pl.operator</a></li>
  <li><a href="../libraries/pl.path.html">pl.path</a></li>
  <li><a href="../libraries/pl.permute.html">pl.permute</a></li>
  <li><a href="../libraries/pl.pretty.html">pl.pretty</a></li>
  <li><a href="../libraries/pl.seq.html">pl.seq</a></li>
  <li><a href="../libraries/pl.sip.html">pl.sip</a></li>
  <li><a href="../libraries/pl.strict.html">pl.strict</a></li>
  <li><a href="../libraries/pl.stringio.html">pl.stringio</a></li>
  <li><a href="../libraries/pl.stringx.html">pl.stringx</a></li>
  <li><a href="../libraries/pl.tablex.html">pl.tablex</a></li>
  <li><a href="../libraries/pl.template.html">pl.template</a></li>
  <li><a href="../libraries/pl.test.html">pl.test</a></li>
  <li><a href="../libraries/pl.text.html">pl.text</a></li>
  <li><a href="../libraries/pl.types.html">pl.types</a></li>
  <li><a href="../libraries/pl.url.html">pl.url</a></li>
  <li><a href="../libraries/pl.utils.html">pl.utils</a></li>
  <li><a href="../libraries/pl.xml.html">pl.xml</a></li>
</ul>
<h2>Classes</h2>
<ul class="nowrap">
  <li><a href="../classes/pl.Date.html">pl.Date</a></li>
  <li><a href="../classes/pl.List.html">pl.List</a></li>
  <li><a href="../classes/pl.Map.html">pl.Map</a></li>
  <li><a href="../classes/pl.MultiMap.html">pl.MultiMap</a></li>
  <li><a href="../classes/pl.OrderedMap.html">pl.OrderedMap</a></li>
  <li><a href="../classes/pl.Set.html">pl.Set</a></li>
</ul>
<h2>Manual</h2>
<ul class="nowrap">
  <li><a href="../manual/01-introduction.md.html">Introduction</a></li>
  <li><a href="../manual/02-arrays.md.html">Tables and Arrays</a></li>
  <li><a href="../manual/03-strings.md.html">Strings. Higher-level operations on strings.</a></li>
  <li><a href="../manual/04-paths.md.html">Paths and Directories</a></li>
  <li><a href="../manual/05-dates.md.html">Date and Time</a></li>
  <li><a href="../manual/06-data.md.html">Data</a></li>
  <li><a href="../manual/07-functional.md.html">Functional Programming</a></li>
  <li><a href="../manual/08-additional.md.html">Additional Libraries</a></li>
  <li><a href="../manual/09-discussion.md.html">Technical Choices</a></li>
</ul>
<h2>Examples</h2>
<ul class="nowrap">
  <li><a href="../examples/seesubst.lua.html">seesubst.lua</a></li>
  <li><a href="../examples/sipscan.lua.html">sipscan.lua</a></li>
  <li><a href="../examples/symbols.lua.html">symbols.lua</a></li>
  <li><a href="../examples/test-cmp.lua.html">test-cmp.lua</a></li>
  <li><a href="../examples/test-data.lua.html">test-data.lua</a></li>
  <li><a href="../examples/test-listcallbacks.lua.html">test-listcallbacks.lua</a></li>
  <li><a href="../examples/test-pretty.lua.html">test-pretty.lua</a></li>
  <li><a href="../examples/test-symbols.lua.html">test-symbols.lua</a></li>
  <li><a href="../examples/testclone.lua.html">testclone.lua</a></li>
  <li><a href="../examples/testconfig.lua.html">testconfig.lua</a></li>
  <li><a href="../examples/testglobal.lua.html">testglobal.lua</a></li>
  <li><a href="../examples/testinputfields.lua.html">testinputfields.lua</a></li>
  <li><a href="../examples/testinputfields2.lua.html">testinputfields2.lua</a></li>
  <li><a href="../examples/testxml.lua.html">testxml.lua</a></li>
  <li><a href="../examples/which.lua.html">which.lua</a></li>
</ul>

</div>

<div id="content">

<h1>Module <code>pl.comprehension</code></h1>
<p>List comprehensions implemented in Lua.</p>
<p> See the <a href="http://lua-users.org/wiki/ListComprehensions">wiki page</a></p>


<pre>
<span class="keyword">local</span> C= <span class="global">require</span> <span class="string">'pl.comprehension'</span> . <span class="function-name">new</span>()

<span class="function-name">C</span> (<span class="string">'x for x=1,10'</span>) ()
==&gt; {<span class="number">1</span>,<span class="number">2</span>,<span class="number">3</span>,<span class="number">4</span>,<span class="number">5</span>,<span class="number">6</span>,<span class="number">7</span>,<span class="number">8</span>,<span class="number">9</span>,<span class="number">10</span>}
<span class="function-name">C</span> <span class="string">'x^2 for x=1,4'</span> ()
==&gt; {<span class="number">1</span>,<span class="number">4</span>,<span class="number">9</span>,<span class="number">16</span>}
<span class="function-name">C</span> <span class="string">'{x,x^2} for x=1,4'</span> ()
==&gt; {{<span class="number">1</span>,<span class="number">1</span>},{<span class="number">2</span>,<span class="number">4</span>},{<span class="number">3</span>,<span class="number">9</span>},{<span class="number">4</span>,<span class="number">16</span>}}
<span class="function-name">C</span> <span class="string">'2*x for x'</span> {<span class="number">1</span>,<span class="number">2</span>,<span class="number">3</span>}
==&gt; {<span class="number">2</span>,<span class="number">4</span>,<span class="number">6</span>}
dbl = <span class="function-name">C</span> <span class="string">'2*x for x'</span>
<span class="function-name">dbl</span> {<span class="number">10</span>,<span class="number">20</span>,<span class="number">30</span>}
==&gt; {<span class="number">20</span>,<span class="number">40</span>,<span class="number">60</span>}
<span class="function-name">C</span> <span class="string">'x for x if x % 2 == 0'</span> {<span class="number">1</span>,<span class="number">2</span>,<span class="number">3</span>,<span class="number">4</span>,<span class="number">5</span>}
==&gt; {<span class="number">2</span>,<span class="number">4</span>}
<span class="function-name">C</span> <span class="string">'{x,y} for x = 1,2 for y = 1,2'</span> ()
==&gt; {{<span class="number">1</span>,<span class="number">1</span>},{<span class="number">1</span>,<span class="number">2</span>},{<span class="number">2</span>,<span class="number">1</span>},{<span class="number">2</span>,<span class="number">2</span>}}
<span class="function-name">C</span> <span class="string">'{x,y} for x for y'</span> ({<span class="number">1</span>,<span class="number">2</span>},{<span class="number">10</span>,<span class="number">20</span>})
==&gt; {{<span class="number">1</span>,<span class="number">10</span>},{<span class="number">1</span>,<span class="number">20</span>},{<span class="number">2</span>,<span class="number">10</span>},{<span class="number">2</span>,<span class="number">20</span>}}
<span class="global">assert</span>(<span class="function-name">C</span> <span class="string">'sum(x^2 for x)'</span> {<span class="number">2</span>,<span class="number">3</span>,<span class="number">4</span>} == <span class="number">2</span>^<span class="number">2</span>+<span class="number">3</span>^<span class="number">2</span>+<span class="number">4</span>^<span class="number">2</span>)
</pre>

<p> (c) 2008 David Manura. Licensed under the same terms as Lua (MIT license).</p>

<p> Dependencies: <a href="../libraries/pl.utils.html#">pl.utils</a>, <a href="../libraries/pl.luabalanced.html#">pl.luabalanced</a></p>

<p> See <a href="../manual/07-functional.md.html#List_Comprehensions">the Guide</a></p>



<br/>
<br/>




</div> <!-- id="content" -->
</div> <!-- id="main" -->
<div id="about">
<i>generated by <a href="http://github.com/stevedonovan/LDoc">LDoc 1.5.0</a></i>
</div> <!-- id="about" -->
</div> <!-- id="container" -->
</body>
</html>