String to boolean with Ruby

toBool.rb

#!/usr/bin/env ruby

def to_b(string)
  case string
  when /^(true|t|yes|y|1)$/i then true
  when /^(false|f|no|n|0)$/i then false
  else raise "Cannot convert to boolean: #{string}"
  end
end
    
puts to_b("true")
puts to_b("false)