irb(main):027:1* 7.times do irb(main):028:1* puts "满地油菜花" irb(main):029:0> end 满地油菜花 满地油菜花 满地油菜花 满地油菜花 满地油菜花 满地油菜花 满地油菜花 => 7
irb(main):033:1* 5.times do |i| irb(main):034:1* puts "第#{i+1}次循环" irb(main):035:0> end 第1次循环 第2次循环 第3次循环 第4次循环 第5次循环 => 5
for语句
for语句与times方法不一样，循环的开始值和结束值可以任意指定
irb(main):009:0> sum=0 irb(main):010:1* for i in 1..5 irb(main):011:1* sum=sum+i irb(main):012:0> end => 1..5 irb(main):013:0> puts sum 15
普通的for语句
irb(main):014:0> names = ["awk","Perl","Python","Ruby"] irb(main):015:1* for name in names irb(main):016:1* puts name irb(main):017:0> end awk Perl Python Ruby
while语句
irb(main):018:0> i=1 irb(main):019:1* while i<3 irb(main):020:1* puts i irb(main):021:1* i+=1 irb(main):022:0> end 1 2
irb(main):023:0> sum = 0 irb(main):024:0> i = 1 irb(main):025:1* while sum<50 irb(main):026:1* sum+=i irb(main):027:1* i+=1 irb(main):028:0> end irb(main):029:0> puts sum 55
until语句
irb(main):030:0> sum = 0 irb(main):031:0> i = 1 irb(main):032:1* until sum >= 50 irb(main):033:1* sum +=i irb(main):034:1* i+=1 irb(main):035:0> end irb(main):036:0> puts sum 55
each方法
irb(main):037:0> names = ["awk","Perl","Pyrhon","Ruby"] irb(main):038:1* names.each do |name| irb(main):039:1* puts name irb(main):040:0> end awk Perl Pyrhon Ruby
loop方法
循环输出Ruby的例子
irb(main):044:1* loop do irb(main):045:1* print "Ruby" irb(main):046:0> end