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James Robertson http://www.r0bertson.co.uk

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Using conditional assignment in Ruby

Use conditional assignment when you want a fail safe method to reference a variable's value. In other words if the variable didn't previously contain a value then it will be initialised with one.

   1  
   2  a = 'crazy'
   3  a ||= 'attentive'
   4  puts 'my current mood is ' + a

=> my current mood is crazy

   1  
   2  a ||= 'attentive'
   3  puts 'my current mood is ' + a

=> my current mood is attentive

References:
- Ruby Programming/Syntax/Operators [wikibooks.org]
- DABlog A short-circuit (||=) edge case [rubypal.com]
to ruby conditional or assignment short-circuit shot-hand by jrobertson on Aug 18, 2008
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