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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | <!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" /><title>Data.Bool.Compat</title><link href="ocean.css" rel="stylesheet" type="text/css" title="Ocean" /><script src="haddock-util.js" type="text/javascript"></script><script src="file:///usr/share/javascript/mathjax/MathJax.js" type="text/javascript"></script><script type="text/javascript">//<![CDATA[
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</script></head><body><div id="package-header"><ul class="links" id="page-menu"><li><a href="src/Data-Bool-Compat.html">Source</a></li><li><a href="index.html">Contents</a></li><li><a href="doc-index.html">Index</a></li></ul><p class="caption">base-compat-0.9.1: A compatibility layer for base</p></div><div id="content"><div id="module-header"><table class="info"><tr><th>Safe Haskell</th><td>Safe</td></tr><tr><th>Language</th><td>Haskell98</td></tr></table><p class="caption">Data.Bool.Compat</p></div><div id="synopsis"><p id="control.syn" class="caption expander" onclick="toggleSection('syn')">Synopsis</p><ul id="section.syn" class="hide" onclick="toggleSection('syn')"><li class="src short"><a href="#v:bool">bool</a> :: a -> a -> <a href="file:///usr/share/doc/ghc-doc/html/libraries/base-4.9.0.0/Data-Bool.html#t:Bool">Bool</a> -> a</li></ul></div><div id="interface"><h1>Documentation</h1><div class="top"><p class="src"><a id="v:bool" class="def">bool</a> :: a -> a -> <a href="file:///usr/share/doc/ghc-doc/html/libraries/base-4.9.0.0/Data-Bool.html#t:Bool">Bool</a> -> a <a href="#v:bool" class="selflink">#</a></p><div class="doc"><p>Case analysis for the <code><a href="file:///usr/share/doc/ghc-doc/html/libraries/base-4.9.0.0/Data-Bool.html#t:Bool">Bool</a></code> type. <code><code><a href="Data-Bool-Compat.html#v:bool">bool</a></code> x y p</code> evaluates to <code>x</code>
when <code>p</code> is <code><a href="file:///usr/share/doc/ghc-doc/html/libraries/base-4.9.0.0/Data-Bool.html#v:False">False</a></code>, and evaluates to <code>y</code> when <code>p</code> is <code><a href="file:///usr/share/doc/ghc-doc/html/libraries/base-4.9.0.0/Data-Bool.html#v:True">True</a></code>.</p><p>This is equivalent to <code>if p then y else x</code>; that is, one can
think of it as an if-then-else construct with its arguments
reordered.</p><h4 id="control.ch:bool0" class="caption expander" onclick="toggleSection('ch:bool0')">Examples</h4><div id="section.ch:bool0" class="hide"><p>Basic usage:</p><pre class="screen"><code class="prompt">>>> </code><strong class="userinput"><code>bool "foo" "bar" True
</code></strong>"bar"
<code class="prompt">>>> </code><strong class="userinput"><code>bool "foo" "bar" False
</code></strong>"foo"
</pre><p>Confirm that <code><code><a href="Data-Bool-Compat.html#v:bool">bool</a></code> x y p</code> and <code>if p then y else x</code> are
equivalent:</p><pre class="screen"><code class="prompt">>>> </code><strong class="userinput"><code>let p = True; x = "bar"; y = "foo"
</code></strong><code class="prompt">>>> </code><strong class="userinput"><code>bool x y p == if p then y else x
</code></strong>True
<code class="prompt">>>> </code><strong class="userinput"><code>let p = False
</code></strong><code class="prompt">>>> </code><strong class="userinput"><code>bool x y p == if p then y else x
</code></strong>True
</pre></div><p><em>Since: 4.7.0.0</em></p></div></div></div></div><div id="footer"><p>Produced by <a href="http://www.haskell.org/haddock/">Haddock</a> version 2.17.2</p></div></body></html>
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