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Dave Hoover explores the psychology of software development

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Fri, 20 Apr 2007

Ruby has variable scoping

Gareth joined me in the d'oh! club today when I revealed to him the revelation that Ryan provided me back in January. Ruby has variable scoping, meaning that this code works just fine:

if false
  a = 1
end

puts a # nil

Up until Ryan revealed this to me, I had been merrily (and needlessly) declaring my variables outside the control structures that defined them. Maybe Gareth and I are the only ones who weren't aware of this aspect of Ruby (and many other dynamic languages), but just in case, I thought I'd share it with you.

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