如何摆脱Ruby中的嵌套循环? [英] How to break from nested loops in Ruby?

问题描述

假设以下红宝石代码:

bank.branches do |branch|
  branch.employees.each do |employee|
    NEXT BRANCH if employee.name = "John Doe"
  end
end

NEXT BRANCH当然是伪代码.有没有一种方法可以使我脱离父循环，例如可以在Perl中做到这一点(通过使用循环标签)?

NEXT BRANCH is of course pseudocode. is there a way that i can break out of a parent loop, the way one can do so in Perl, for example (by employing loop labels)?

提前谢谢.

推荐答案

抓住和扔可能是您想要的:

bank.branches do |branch|
  catch :missingyear do  #:missingyear acts as a label
    branch.employees.each do |employee|
      (2000..2011).each do |year|
        throw :missingyear unless something  #break out of two loops
      end
    end
  end #You end up here if :missingyear is thrown
end

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