for문
for i in 1..10 for j in 1..i print "*" end puts "" end a = [1,2,3,4,5] for i in a print i," ", a[i], "\n" end
until문
num = 100 until num < 10 do num-=1 puts num end
while문
num = 1 while num < 10 do num+=1 puts num end
next, redo, break, retry
for i in 1..100 if i % 2 == 0 then print i next end if i > 80 then break end end for i in 1..100 if i % 2 == 0 then print i i=101 redo end end for i in 1..100 if i % 10 == 0 then print i retry end end