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    <p>Create your own module/library which you include into scope when you need it to perform this task. </p> <p>Such as "requre 'unitCoversions' " </p> <p>And Chances are, somebody has already done this if you look hard enough :)</p> <p>However <em>DONT</em> try modifying the native core class, that will only end in Misery. </p> <p>( Also, the class you want to extend is 'numeric' , that will apply to both Integers and Floats :) ) </p> <blockquote> <p>Not entirely clear why I shouldn't do this... Rails does this to the string class to great success. </p> </blockquote> <p>Because it <em>can</em> be done doesn't mean it <em>should</em> be done. 'Monkey Patching' as it is known can have all sorts of odd side effects, and they can be an epic failure when done wrong. </p> <p>Do it when there is no good alternative. </p> <p>Because if you really wanted to do something daft, you could build an entire framework that <em>ALL</em> it did was monkey patch the core classes. </p> <p>Just for example, flip databasing on its head. </p> <pre><code>5.getArtist(); 10.getEvent(); 100.getTrack(); </code></pre> <p>etc etc. there is no limit to how many bad ways there are to do that. </p> <pre><code>"Bob".createUser(); </code></pre> <p>misery in a cup. </p> <p>If you want to do something practical, have a Convert class or function, </p> <pre><code>convert( 3 , { :from=&gt;:miles, :to=&gt;:meters }); </code></pre> <p>at least you're not polluting the global namespace and core functions that way and it makes more coherent sense. </p>
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    1. POWhere is the best place to add methods to the Integer class in Rails?
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