Kotlinのfor

1, 2, 3, 4, 5:

for (i in 1..5)

1, 3, 5:

for (i in 1..5 step 2)

1, 2, 3, 4:

for (i in 1 until 5)

5, 4, 3, 2, 1:

for (i in 5 downTo 1)

5, 3, 1:

for (i in 5 downTo 1 step 2)