ruby酷酷的方法——另一种next

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irb(main):022:0* 1.next => 2 irb(main):023:0> "a".next => "b" irb(main):024:0> "1".next => "2" irb(main):025:0>

性能比较：

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require 'benchmark'   n=(1..1000000).to_a def num_next(first,last)     while first != last             first=first.next     end       end     def num_join(first,last)         while first != last               first+=1         end end   Benchmark.bm do |bm|     bm.report("each") do         n.each do |d|             d         end     end       bm.report("next") do         num_next(1,1000000)     end       bm.report("  + ") do         num_join(1,1000000)     end end

 

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输出：

      user     system      total        real

each  0.219000   0.000000   0.219000 (  0.218000)

next  0.266000   0.000000   0.266000 (  0.266000)

  +   0.312000   0.000000   0.312000 (  0.313000)

 性能还不错，向ruby脱帽致敬！！