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<h1><a href="../../">wren</a></h1>
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<h2>a classy little scripting language</h2>
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<li><a href="../">Modules</a></li>
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<li><a href="./">random</a></li>
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<h2>random classes</h2>
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<li><a href="random.html">Random</a></li>
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<td><a href="./">random</a></td>
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<td colspan="2"><h2>random classes</h2></td>
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<li><a href="random.html">Random</a></li>
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<h1>Random Class</h1>
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<p>A simple, fast pseudo-random number generator. Internally, it uses the <a href="https://en.wikipedia.org/wiki/Well_equidistributed_long-period_linear">well
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equidistributed long-period linear PRNG</a> (WELL512a). </p>
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<p>Each instance of the class generates a sequence of randomly distributed numbers
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based on the internal state of the object. The state is initialized from a
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<em>seed</em>. Two instances with the same seed generate the exact same sequence of
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numbers. </p>
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<p>It must be imported from the <a href="../">random</a> module: </p>
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<div class="codehilite"><pre><span class="k">import</span> <span class="s">"random"</span> <span class="k">for</span> <span class="vg">Random</span>
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</pre></div>
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<h2>Constructors <a href="#constructors" name="constructors" class="header-anchor">#</a></h2>
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<h3>Random.<strong>new</strong>() <a href="#random.new()" name="random.new()" class="header-anchor">#</a></h3>
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<p>Creates a new generator whose state is seeded based on the current time. </p>
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<div class="codehilite"><pre><span class="k">var</span> <span class="n">random</span> <span class="o">=</span> <span class="vg">Random</span><span class="o">.</span><span class="n">new</span><span class="p">()</span>
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</pre></div>
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<h3>Random.<strong>new</strong>(seed) <a href="#random.new(seed)" name="random.new(seed)" class="header-anchor">#</a></h3>
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<p>Creates a new generator initialized with [seed]. The seed can either be a
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number, or a non-empty sequence of numbers. If the sequnce has more than 16
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elements, only the first 16 are used. If it has fewer, the elements are cycled
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to generate 16 seed values. </p>
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<div class="codehilite"><pre><span class="vg">Random</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="mi">12345</span><span class="p">)</span>
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<span class="vg">Random</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="s">"appleseed"</span><span class="o">.</span><span class="n">codePoints</span><span class="p">)</span>
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</pre></div>
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<h2>Methods <a href="#methods" name="methods" class="header-anchor">#</a></h2>
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<h3><strong>float</strong>() <a href="#float()" name="float()" class="header-anchor">#</a></h3>
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<p>Returns a floating point value between 0.0 and 1.0, including 0.0, but excluding
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1.0. </p>
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<div class="codehilite"><pre><span class="k">var</span> <span class="n">random</span> <span class="o">=</span> <span class="vg">Random</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="mi">12345</span><span class="p">)</span>
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<span class="vg">System</span><span class="o">.</span><span class="n">print</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">float</span><span class="p">())</span> <span class="output">0.53178795980617</span>
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<span class="vg">System</span><span class="o">.</span><span class="n">print</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">float</span><span class="p">())</span> <span class="output">0.20180515043262</span>
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<span class="vg">System</span><span class="o">.</span><span class="n">print</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">float</span><span class="p">())</span> <span class="output">0.43371948658705</span>
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</pre></div>
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<h3><strong>float</strong>(end) <a href="#float(end)" name="float(end)" class="header-anchor">#</a></h3>
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<p>Returns a floating point value between 0.0 and <code>end</code>, including 0.0 but
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excluding <code>end</code>. </p>
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<div class="codehilite"><pre><span class="k">var</span> <span class="n">random</span> <span class="o">=</span> <span class="vg">Random</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="mi">12345</span><span class="p">)</span>
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<span class="vg">System</span><span class="o">.</span><span class="n">print</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">float</span><span class="p">(</span><span class="mi">0</span><span class="p">))</span> <span class="output">0</span>
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<span class="vg">System</span><span class="o">.</span><span class="n">print</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">float</span><span class="p">(</span><span class="mi">100</span><span class="p">))</span> <span class="output">20.180515043262</span>
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<span class="vg">System</span><span class="o">.</span><span class="n">print</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">float</span><span class="p">(</span><span class="o">-</span><span class="mi">100</span><span class="p">))</span> <span class="output">-43.371948658705</span>
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</pre></div>
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<h3><strong>float</strong>(start, end) <a href="#float(start,-end)" name="float(start,-end)" class="header-anchor">#</a></h3>
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<p>Returns a floating point value between <code>start</code> and <code>end</code>, including <code>start</code> but
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excluding <code>end</code>. </p>
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<div class="codehilite"><pre><span class="k">var</span> <span class="n">random</span> <span class="o">=</span> <span class="vg">Random</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="mi">12345</span><span class="p">)</span>
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<span class="vg">System</span><span class="o">.</span><span class="n">print</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">float</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">))</span> <span class="output">3.5317879598062</span>
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<span class="vg">System</span><span class="o">.</span><span class="n">print</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">float</span><span class="p">(</span><span class="o">-</span><span class="mi">10</span><span class="p">,</span> <span class="mi">10</span><span class="p">))</span> <span class="output">-5.9638969913476</span>
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<span class="vg">System</span><span class="o">.</span><span class="n">print</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">float</span><span class="p">(</span><span class="o">-</span><span class="mi">4</span><span class="p">,</span> <span class="mi">2</span><span class="p">))</span> <span class="output">-1.3976830804777</span>
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</pre></div>
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<h3><strong>int</strong>(end) <a href="#int(end)" name="int(end)" class="header-anchor">#</a></h3>
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<p>Returns an integer between 0 and <code>end</code>, including 0 but excluding <code>end</code>. </p>
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<div class="codehilite"><pre><span class="k">var</span> <span class="n">random</span> <span class="o">=</span> <span class="vg">Random</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="mi">12345</span><span class="p">)</span>
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<span class="vg">System</span><span class="o">.</span><span class="n">print</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">int</span><span class="p">(</span><span class="mi">1</span><span class="p">))</span> <span class="output">0</span>
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<span class="vg">System</span><span class="o">.</span><span class="n">print</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">int</span><span class="p">(</span><span class="mi">10</span><span class="p">))</span> <span class="output">2</span>
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<span class="vg">System</span><span class="o">.</span><span class="n">print</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">int</span><span class="p">(</span><span class="o">-</span><span class="mi">50</span><span class="p">))</span> <span class="output">-22</span>
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</pre></div>
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<h3><strong>int</strong>(start, end) <a href="#int(start,-end)" name="int(start,-end)" class="header-anchor">#</a></h3>
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<p>Returns an integer between <code>start</code> and <code>end</code>, including <code>start</code> but excluding
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<code>end</code>. </p>
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<div class="codehilite"><pre><span class="k">var</span> <span class="n">random</span> <span class="o">=</span> <span class="vg">Random</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="mi">12345</span><span class="p">)</span>
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<span class="vg">System</span><span class="o">.</span><span class="n">print</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">int</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">))</span> <span class="output">3</span>
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<span class="vg">System</span><span class="o">.</span><span class="n">print</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">int</span><span class="p">(</span><span class="o">-</span><span class="mi">10</span><span class="p">,</span> <span class="mi">10</span><span class="p">))</span> <span class="output">-6</span>
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<span class="vg">System</span><span class="o">.</span><span class="n">print</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">int</span><span class="p">(</span><span class="o">-</span><span class="mi">4</span><span class="p">,</span> <span class="mi">2</span><span class="p">))</span> <span class="output">-2</span>
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</pre></div>
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