Pastable version of Need explaination

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            <pre class="sunburst"><span style="color:#E28964;">require</span> <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span>erb<span style="color:#65B042;">&quot;</span></span>

<span style="color:#AEAEAE;font-style:italic;"><span style="color:#AEAEAE;font-style:italic;">#</span> build data class</span>
<span style="color:#E28964;">class</span> <span style="text-decoration:underline;">Listings</span>
  <span style="color:#3E87E3;">PRODUCT</span> <span style="color:#E28964;">=</span> { <span style="color:#3387CC;"><span style="color:#3387CC;">:</span>name</span> =&gt; <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span>Chicken Fried Steak<span style="color:#65B042;">&quot;</span></span>,
              <span style="color:#3387CC;"><span style="color:#3387CC;">:</span>desc</span> =&gt; <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span>A well messages pattie, breaded and fried.<span style="color:#65B042;">&quot;</span></span>,
              <span style="color:#3387CC;"><span style="color:#3387CC;">:</span>cost</span> =&gt; <span style="color:#3387CC;">9.95</span> }

<span style="color:#E28964;">attr_reader</span> <span style="color:#3387CC;"><span style="color:#3387CC;">:</span>product</span>, <span style="color:#3387CC;"><span style="color:#3387CC;">:</span>price</span>

<span style="color:#E28964;">def</span> <span style="color:#89BDFF;">initialize</span>(<span style="color:#3E87E3;"> product <span style="color:#E28964;">=</span> <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span><span style="color:#65B042;">&quot;</span></span><span style="color:#3E87E3;">,</span> price <span style="color:#E28964;">=</span> <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span><span style="color:#65B042;">&quot;</span></span> </span>)
    <span style="color:#3E87E3;"><span style="color:#3E87E3;">@</span>product</span> <span style="color:#E28964;">=</span> product
    <span style="color:#3E87E3;"><span style="color:#3E87E3;">@</span>price</span> <span style="color:#E28964;">=</span> price
  <span style="color:#E28964;">end</span>

<span style="color:#E28964;">def</span> <span style="color:#89BDFF;">build</span>
    b <span style="color:#E28964;">=</span> binding
<span style="color:#AEAEAE;font-style:italic;">    <span style="color:#AEAEAE;font-style:italic;">#</span> create and run templates, filling member data variebles</span>
    <span style="color:#3E87E3;">ERB</span>.<span style="color:#89BDFF;">new</span>(<span style="color:#E28964;">&lt;&lt;</span><span style="color:#E28964;">-</span><span style="color:#65B042;"><span style="color:#65B042;">'</span>END_PRODUCT<span style="color:#65B042;">'</span></span>.<span style="color:#89BDFF;">gsub</span>(<span style="color:#E9C062;"><span style="color:#E9C062;">/</span></span><span style="color:#E9C062;">^<span style="color:#CF7D34;">\s</span>+</span><span style="color:#E9C062;"><span style="color:#E9C062;">/</span></span>, <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span><span style="color:#65B042;">&quot;</span></span>), <span style="color:#3387CC;">0</span>, <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span><span style="color:#65B042;">&quot;</span></span>, <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span>@product<span style="color:#65B042;">&quot;</span></span>).<span style="color:#89BDFF;">result</span> b
      <span style="color:#E28964;">&lt;</span><span style="color:#E28964;">%=</span> <span style="color:#3E87E3;">PRODUCT</span>[<span style="color:#3387CC;"><span style="color:#3387CC;">:</span>name</span>] <span style="color:#65B042;"><span style="color:#65B042;">%&gt;</span></span>
<span style="color:#65B042;">      &lt;%= PRODUCT[:desc] %<span style="color:#65B042;">&gt;</span></span>
    <span style="color:#3E87E3;">END_PRODUCT</span>
    <span style="color:#3E87E3;">ERB</span>.<span style="color:#89BDFF;">new</span>(<span style="color:#E28964;">&lt;&lt;</span><span style="color:#E28964;">-</span><span style="color:#65B042;"><span style="color:#65B042;">'</span>END_PRICE<span style="color:#65B042;">'</span></span>.<span style="color:#89BDFF;">gsub</span>(<span style="color:#E9C062;"><span style="color:#E9C062;">/</span></span><span style="color:#E9C062;">^<span style="color:#CF7D34;">\s</span>+</span><span style="color:#E9C062;"><span style="color:#E9C062;">/</span></span>, <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span><span style="color:#65B042;">&quot;</span></span>), <span style="color:#3387CC;">0</span>, <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span><span style="color:#65B042;">&quot;</span></span>, <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span>@price<span style="color:#65B042;">&quot;</span></span>).<span style="color:#89BDFF;">result</span> b
      <span style="color:#E28964;">&lt;</span><span style="color:#E28964;">%=</span> <span style="color:#3E87E3;">PRODUCT</span>[<span style="color:#3387CC;"><span style="color:#3387CC;">:</span>name</span>] <span style="color:#65B042;"><span style="color:#65B042;">%&gt;</span> -- &lt;%= PRODUCT[:cost] %<span style="color:#65B042;">&gt;</span></span>
      <span style="color:#E28964;">&lt;</span><span style="color:#E28964;">%=</span> <span style="color:#3E87E3;">PRODUCT</span>[<span style="color:#3387CC;"><span style="color:#3387CC;">:</span>desc</span>] <span style="color:#65B042;"><span style="color:#65B042;">%&gt;</span></span>
<span style="color:#65B042;">    END_PRICE</span>
<span style="color:#65B042;">  end</span>
<span style="color:#65B042;">end</span>
<span style="color:#65B042;"></span>
<span style="color:#65B042;"># setup template data</span>
<span style="color:#65B042;">listings = Listings.new</span>
<span style="color:#65B042;">listings.build</span>
<span style="color:#65B042;"></span>
<span style="color:#65B042;">puts listings.product + &quot;<span style="color:#DDF2A4;">\n</span>&quot; + listings.price</span>
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