range

print 1…5 
1 2 3 4 5

1…5 do print it
1 2 3 4 5

for i in 1…5
    print i
1 2 3 4 5

see iteration and for loops:

for 1..10 : print it // excluding 10
for 1...10 : print it // including 10
for 1 to 10 : print it // including 10
for 1 upto 10 : print it // excluding 10