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Id
14697343
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0
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0
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10
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CreationDate
2013-02-04T23:00:16.573
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0
LastActivityDate
2018-04-10T10:05:17.783
LastEditDate
2018-04-10T10:05:17.783
LastEditorUserId
1141264
OwnerUserId
263268
ParentId
995593
PostTypeId
2
Score
495
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0
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text
Body
<code>a ||= b</code> is a "conditional assignment operator". It is sort-of-but-not-quite(*) shorthand for <code>a || a = b</code>. It means "if <code>a</code> is undefined or <a href="https://gist.github.com/jfarmer/2647362" rel="noreferrer">falsey</a> (<code>false</code> or <code>nil</code>), then evaluate <code>b</code> and set <code>a</code> to the result". For example: <pre><code>> a ||= nil => nil > a ||= 0; => 0 > a ||= 2; => 0 > foo = false; => false > foo ||= true; => true > foo ||= false; => true </code></pre> Ruby's short circuit evaluation means that if <code>a</code> is defined and evaluates to truthy, then the right hand side of the operator is not evaluated, and no assignment takes place. This distinction is unimportant if <code>a</code> and <code>b</code> are both local variables, but is significant if either is a getter/setter method of a class. Confusingly, it looks similar to other assignment operators (such as <code>+=</code>) but behaves differently. <code>a += b</code>   translates to   <code>a = a + b</code> <code>a ||= b</code>   roughly translates to*    <code>a || a = b</code> *Except that, when <code>a</code> is undefined, <code>a || a = b</code> would be NameError, whereas <code>a ||= b</code> sets <code>a</code> to <code>b</code>. Further reading: <ul> <li><a href="http://www.rubyinside.com/what-rubys-double-pipe-or-equals-really-does-5488.html" rel="noreferrer">http://www.rubyinside.com/what-rubys-double-pipe-or-equals-really-does-5488.html</a></li> </ul>
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1. POWhat does ||= (or-equals) mean in Ruby?
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1. USDickieBoy
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1. USSteve Bennett
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1. COThank you for this answer, it make much more sense.
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2. COBest answer given! Thanks man!
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3. COThis trumps the accepted answer. Thanks.
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 USAdam Waite

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