Ruby - Looping

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While

counter = 1
while counter < 11
  puts counter
  counter = counter + 1
end

Until

i = 0
until i == 6
  i += 1
end
puts i

For

for num in 1...10
  puts num
end

iterator

i = 20
loop do
  i -= 1
  print "#{i}"
  break if i <= 0
end

next

for i in 1..5
  next if i % 2 == 0
  print i
end

.each iterator

object.each { |item| # Do something }

You can also use the do keyword instead of {}:

object.each do |item| # Do something end

The variable name between | | can be anything you like: it‘s just a placeholder for each element of the object you‘re using .each on.

array = [1,2,3,4,5]

array.each do |x|
  x += 10
  print "#{x}"
end

.times iterator

10.times {print "haha"}

Ruby - Looping

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原文地址：http://www.cnblogs.com/elewei/p/5686410.html