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2013-02-16T19:47:55.957
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2013-02-16T20:00:42.483
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2013-02-16T20:00:42.483
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The assignment operator in the Ruby Language allow <a href="http://en.wikibooks.org/wiki/Ruby_Programming/Syntax/Operators" rel="nofollow">Multiple assignments</a> (aka: parallel assignment). Say lvalue the left side variables or attributes on the left side of the assignment operator (=) and say rvalue the right side values. By Multiple assignments you can assign one comma delimited list to another, with corresponding variables on the left side getting corresponding values from the right <h3>first parallel assignment</h3> <pre><code>a, b = ["ho", "hey"] </code></pre> if the last rvalue is an array, you can prefix it with an asterisk, which effectively expands it into its constituent values in place. the asterisk is not necessary if the rvalue is the only thing on the right-hand side the array will be expanded automatically. To better understand, try this: <pre><code>>> a,b,c = "1",*["ho", "hey"] => ["1", "ho", "hey"] >> a => "1" >> b => "ho" >> c => "hey" </code></pre> let's see again: <pre><code>>> a,b,c = "1",["ho", "hey"] => ["1", ["ho", "hey"]] >> a => "1" >> b => ["ho", "hey"] >> c => nil </code></pre> as you can see, if we don't prefix the array with the * then the array is not expanded. <h3>second parallel assignment</h3> <pre><code>c, d = "foo", "bar" </code></pre> "foo", "bar" are two <a href="http://en.wikibooks.org/wiki/Ruby_Programming/Syntax/Literals" rel="nofollow">literal Strings</a> assigned to the corresponding variable on the left side. <h3>third parallel assignment</h3> <pre><code>a, b = ["blerg"], ["baz"])? </code></pre> <code>["blerg"]</code> and <code>["baz"]</code> are two Array each one containing one element of class String; therefore each "Array of a sigle String" is assigned to the corresponding variable on the left side.
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1. POwhy does ruby parallel assignment with array of strings returns string
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1. USFranco Rondini
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