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Assign a variable a value if it's nil (See related posts)

There is a nifty way to give a variable a value if it's nil 

   1  
   2  a[i] ||=0


This is useful when you want to assign a value to an array and it's not yet initialized.
to ruby idioms by raj2569 on Mon Dec 18 13:16:49 -0500 2006

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