Once set, variables are always defined

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Jan 24 ’12

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Once set, variables are always defined

When you set a variable in a section of code that is never executed, the variable will still be defined.

if false
  a = 'whatever'
end

puts a
# => "nil"
# Does NOT raise 'NameError: undefined local variable or method `a' for main:Object'

This post was submitted by Olivier El Mekki.

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