each 循环
控制流 / 循环
each 循环
for-in 循环
each_with_index 循环
while 循环
do-while 循环
until 循环
upto 循环
step 循环
times 循环
无限循环
sum10 =
0
(
1
.
.10
).
each
do
|v|
sum10 += v
end
# sum10 is 55
puts
"sum10 is
#{sum10}
"
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