ruby的循环控制命令loop等

ruby的循环有以下几种：

times方法　　for　　while　　until（与while相反）

each（与for极度相似，在ruby内部，for语句是用each实现的）　　loop（无限循环，与break搭档）

下 表是循环控制命令

举例如下：break 会终止全体程序

p "break的例子"
i = 0
["a", "b", "c", "d", "e"].each do |name|
  i += 1
  if i ==3
    break
  end
  p [i,name]
end#=》

“break的例子”
[1, “a”]
[2, “b”]

next使用后，程序会忽略后面的部分，开始进行下一次循环

p "next的例子"
i = 0
["a", "b", "c", "d", "e"].each do |name|
  i += 1
  if i ==3
    next
  end
  p [i,name]
end#=>

“next的例子”
[1, “a”]
[2, “b”]
[4, “d”]
[5, “e”]

p "redo的例子"
i = 0
["a", "b", "c", "d", "e"].each do |name|
  i += 1
  if i ==3
    redo
  end
  p [i,name]
end

“redo的例子”
[1, “a”]
[2, “b”]
[4, “c”]
[5, “d”]
[6, “e”]