Proc objects are blocks of code that have been bound to a set of local variables. Once bound, the code may be called in different contexts and still access those variables.

   def gen_times(factor)
     return Proc.new {|n| n*factor }

   times3 = gen_times(3)
   times5 = gen_times(5)

   times3.call(12)               #=> 36
   times5.call(5)                #=> 25
   times3.call(times5.call(4))   #=> 60
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