A summary of circular statements in Ruby _ruby topics

while (when ...) ) loop	While condition Statement 1; Statement 2; Statement... End
Single While loop	(statement 1; Statement 2; Statement... ) While condition
Until (until ...) ) loop	Until condition = While not (condition)
For...in cycle	For variable in object Statement 1; Statement 2; Statement... End
Break	Jump out of the loop when the layer
Next	Ignore the rest of the cycle and start the next loop
Redo	Start the cycle again, or from this time
Retry	Start over, this cycle body.
Times	3.times {print "hi!"} #Hi! Hi! Hi!
Upto	1.upto (9) {|i| print i if i<7} #123456
Downto	9.downto (1) {|i| print i if i<7} #654321
each	(1..9). Each {|i| print i if i<7} #123456
Step	0.step (11,3) {|i| Print i} #0369