Re: variable from array to function to array

Here an improved version that allows you to use an arbitrary,
possible different set of properties for each question.
Random values are returned if you provide a Range or an Array.

(And it now uses the hash interpolation pointed out by Sean
instead of erb,)


class Question

   def initialize(text, substitutions)
     @text = text
     @substitutions = substitutions
   end

   def to_s
     subst = {}
     @substitutions.each do |k, v|
       if v.class == Range
         subst[k] = rand(v)
       elsif v.class == Array
         subst[k] = v.sample
       else
         subst[k] = v
       end
     end
     @text % subst
   end
end

# You can use arbitrary keys.
# For ranges or arrays a random number / element is used.
questions = [
   Question.new('A slide is placed %{val} %{unit} %{side} of...',
                {:val => 20..40, :unit => 'cm',
                :side => ['left', 'right']}),
   Question.new('An image is ... %{val} mm ... and %{factor} times...',
                {:val => 10..15, :factor => 2..9})
]

questions.each {|q| puts q }
questions.each {|q| puts q }  # gives different values


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