ruby各种循环的写法
最常用的:
#1
length = array.list
length.times do |i|
print "#{array[i]}"
end
#2
array.each do |value|
print "#{value}"
end
#3
for vaule in array do
print "#{value}"
end
#4
array.each_index do |i|
print "#{array[i]}"
end
其他写法:
#5
length = array.list
i = 0
until i==length do
print "#{array[i]}"
i += 1
end
#6
length = array.list-1
for i in 0..length do
print "#{array[i]}"
end
#7
length = array.list
i = 0
while i< length do
print "#{array[i]}"
i = i+1
end
#8
length = array.list - 1
0.upto(length) do |i| #也可用downto:length.downto(0) do |i|
print "#{array[i]}"
end
#9
length = array.list -1
i = 0
loop do
print "#{array[i]}"
i += 1
break if i > length #也可以用break unless i <= length
end