https://ruby-china.org/ifenx en-us <p>require 'find'</p> <p>IGNORES = [ /^./ , /^CVS$/ ,/^RCS$/ ]</p> <p>def listdir(top) Find.find(top){ |path| if FileTest.directory?(path) dir, base = File.split(path) IGNORES.each{|re| if re =~ base Find.prune end } puts path end</p> <p>} end</p> <p>listdir(ARGV[0])</p> <p>上面程序中 /^./ , /^CVS$/ ,/^RCS$/ 分别表示什么 麻烦解释下</p> ifenx Mon, 04 Mar 2013 15:16:34 +0800 https://ruby-china.org/topics/9117 https://ruby-china.org/topics/9117 <p>ary = Array.new(12){ |i| i+1 } ary.each(|item| if item.to_i % 5 != 0 then ary.delete(item) end ) p ary</p> <p>被除数是 2 的时候： [2, 4, 6, 8, 10, 12]</p> <p>被除数是 3 的时候： [2, 3, 5, 6, 8, 9, 11, 12]</p> <p>被除数是 4 的时候： [2, 4, 6, 8, 10, 12]</p> <p>被除数是 5 的时候： [2, 4, 5, 7, 9, 10, 12]</p> <p>请大侠指点指点下 为什么输出结果只有 当被除数是 2 是正常的 如果 是 3，4，5 输出的结果都是错的</p> ifenx Mon, 25 Feb 2013 11:15:26 +0800 https://ruby-china.org/topics/8905 https://ruby-china.org/topics/8905 <p>1） a = Array.new(100){|i| i+1} b = Array.new for i in 0...a.length if (a[i].to_i % 3) == 0 then b &lt;&lt; a[i] a.delete_at(i) end end</p> <p>p b p a</p> <p>2） a = Array.new(100){|i| i+1} b = Array.new a.each_with_index{|item,i| if item.to_i % 3 == 0 then b &lt;&lt; item a.delete_at(i) end }</p> <p>p b p a</p> <p>运行结果：</p> <p>1） [3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 93, 96, 99, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil] [1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, 20, 22, 23, 25, 26, 28, 29, 31, 32, 34, 35, 37, 38, 40, 41, 43, 44, 46, 47, 49, 50, 52, 53, 55, 56, 58, 59, 61, 62, 64, 65, 67, 68, 70, 71, 73, 74, 76, 77, 79, 80, 82, 83, 85, 86, 88, 89, 91, 92, 94, 95, 97, 98, 100]</p> <p>2） [3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 93, 96, 99] [1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, 20, 22, 23, 25, 26, 28, 29, 31, 32, 34, 35, 37, 38, 40, 41, 43, 44, 46, 47, 49, 50, 52, 53, 55, 56, 58, 59, 61, 62, 64, 65, 67, 68, 70, 71, 73, 74, 76, 77, 79, 80, 82, 83, 85, 86, 88, 89, 91, 92, 94, 95, 97, 98, 100]</p> <p>麻烦 帮忙看看 1）是什么问题 为什么会有 nil</p> ifenx Fri, 22 Feb 2013 23:27:08 +0800 https://ruby-china.org/topics/8860 https://ruby-china.org/topics/8860