for i in [1..10] console.log i
puts = console.log
puts (i for i in [0..20] by 2).join ',' puts (i for i in [0..20] when i % 2 is 1).join ',' puts (i for i in [0..20] when i % 2 isnt 0).join ','
a : or default_value a : + default_value