源代码:
#!/usr/bin/ruby $, = ", " months = Hash.new( "month" ) months = {"1" => "January", "2" => "February"} keys = months.keys puts "#{keys}"
运行结果：
#!/usr/bin/ruby $, = ", " months = Hash.new( "month" ) months = {"1" => "January", "2" => "February"} keys = months.keys puts "#{keys}"