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POCommon Ruby Idioms
 

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    <p>One thing I love about ruby is that mostly it is a very readable language (which is great for self-documenting code)</p> <p>However, inspired by this question: <a href="https://stackoverflow.com/questions/609612/ruby-code-explained">Ruby Code explained</a> and the description of how <code>||=</code> works in ruby, I was thinking about the ruby idioms I don't use, as frankly, I don't fully grok them.</p> <p>So my question is, similar to the example from the referenced question, what common, but not obvious, ruby idioms do I need to be aware of to be a truly proficient ruby programmer?</p> <p>By the way, from the referenced question</p> <pre><code>a ||= b </code></pre> <p>is equivalent to</p> <pre><code>if a == nil || a == false a = b end </code></pre> <p>(Thanks to Ian Terrell for the correction)</p> <p><strong>Edit:</strong> It turns out this point is not totally uncontroversial. The correct expansion is in fact</p> <pre><code>(a || (a = (b))) </code></pre> <p>See these links for why:</p> <ul> <li><a href="http://DABlog.RubyPAL.Com/2008/3/25/a-short-circuit-edge-case/" rel="nofollow noreferrer">http://DABlog.RubyPAL.Com/2008/3/25/a-short-circuit-edge-case/</a></li> <li><a href="http://DABlog.RubyPAL.Com/2008/3/26/short-circuit-post-correction/" rel="nofollow noreferrer">http://DABlog.RubyPAL.Com/2008/3/26/short-circuit-post-correction/</a></li> <li><a href="http://ProcNew.Com/ruby-short-circuit-edge-case-response.html" rel="nofollow noreferrer">http://ProcNew.Com/ruby-short-circuit-edge-case-response.html</a> </li> </ul> <p>Thanks to Jörg W Mittag for pointing this out.</p>
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    1. COit's often more concisely stated as: `foo ||= bar` is equivalent to `foo || foo = bar`
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    2. COI think it's more clear to say it's equivalent to foo = foo || bar, in the same way that foo *= bar is equivalent to foo = foo * bar.
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    3. COChuck - except that's not true. The difference is in cases like `obj.foo ||= bar` If it was `obj.foo = obj.foo || bar` then obj.foo= would be called even if obj.foo was falseish (and obj.foo= might have side effects). But that isn't how it works
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