gistfile1.rb

def divider a, b
  a / b
end

handlers = {}

handlers[TypeError] =
  Proc.new { |e| puts "Type exception occured." }

handlers[ZeroDivisionError] =
  Proc.new { |e| puts "Division by 0 occured." }

def supervise p, args, handlers
  begin
      Thread.new {
        p.call(args)
      }.value
  rescue => e
    handlers[e.class].call(e)
  end
end

proc = Proc.new {|a, b| divider(a, b)}

supervise(proc, [5, 5], handlers)   # => 5
supervise(proc, [5, nil], handlers) # => Type exception occured.
supervise(proc, [5, 0], handlers)   # => Division by 0 occured.