hash driven conditional statements

condition.rb

#!/usr/bin/env ruby

class A
  CONDITION = {
    nil   => :a,
    false => :b,
    true  => :c
  }

  def abc(val)
    self.send CONDITION[val]
  end

  private
  def a; puts 'a'; end
  def b; puts 'b'; end
  def c; puts 'c'; end
end

A.new.abc(nil)
A.new.abc(false)
A.new.abc(true)