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primarykey
Id
12701991
data
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2012-10-03T04:38:41.803
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2012-10-03T04:38:41.803
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LastEditorUserId
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Score
4
ViewCount
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LastEditorDisplayName
text
Body
As the others pointed out, <code>||</code> first evaluates the expression on the left. If it is "true" (anything except <code>false</code> or <code>nil</code>), it returns that. Otherwise, it evaluates the expression on the right, and returns it (no matter what it is). This makes <code>||</code> useful for a lot more than just boolean tests. For example, I just used it the other day when writing some code for the <code>chronic</code> gem: <pre><code>@now = options[:now] || Chronic.time_class.now </code></pre> That means: "if the <code>options</code> hash includes a <code>:now</code> value, store that in <code>@now</code>. Otherwise, fall back on <code>Chronic.time_class.now</code> as a default". I'm sure you can think of lots of possible applications in your own programs. <code>&&</code> is analogous: it first evaluates the expression on the left, and if it evaluates to <code>false</code> or <code>nil</code>, it returns that. Otherwise, it evaluates the expression on the right, and returns it (no matter what it is). This means <code>&&</code> is also useful for a lot more than just boolean tests. You can use it to squeeze two lines of code into one. For example: <pre><code>do_something && do_something_else </code></pre> (That only works if you know that the return value of <code>do_something</code> will never be <code>false</code> or <code>nil</code>!) You can also use <code>&&</code> to squeeze a "guard" expression on the same line as what it is "guarding": <pre><code>message && send_message(message) </code></pre> Which could replace: <pre><code>unless message.nil? send_message(message) end </code></pre>
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1. POnil || false and false || nil in ruby
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1. USAlex D
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1. COI am still learning ruby but this is really helpful.
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