　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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sh-3ll 1.0

DIR:/opt/alt/ruby18/share/ri/1.8/system/Enumerable/

Current File : //opt/alt/ruby18/share/ri/1.8/system/Enumerable/reduce-i.yaml

--- !ruby/object:RI::MethodDescription 
aliases: []

block_params: 
comment: 
- !ruby/struct:SM::Flow::VERB 
  body: "   enum.reduce(initial, sym) =&gt; obj\n   enum.reduce(sym)          =&gt; obj\n   enum.reduce(initial) {| memo, obj | block }  =&gt; obj\n   enum.reduce          {| memo, obj | block }  =&gt; obj\n"
- !ruby/struct:SM::Flow::P 
  body: Combines all elements of <em>enum</em> by applying a binary operation, specified by a block or a symbol that names a method or operator.
- !ruby/struct:SM::Flow::P 
  body: If you specify a block, then for each element in <em>enum&lt;i&gt; the block is passed an accumulator value (&lt;i&gt;memo</em>) and the element. If you specify a symbol instead, then each element in the collection will be passed to the named method of <em>memo</em>. In either case, the result becomes the new value for <em>memo</em>. At the end of the iteration, the final value of <em>memo</em> is the return value fo the method.
- !ruby/struct:SM::Flow::P 
  body: If you do not explicitly specify an <em>initial</em> value for <em>memo</em>, then uses the first element of collection is used as the initial value of <em>memo</em>.
- !ruby/struct:SM::Flow::P 
  body: "Examples:"
- !ruby/struct:SM::Flow::VERB 
  body: "   # Sum some numbers\n   (5..10).reduce(:+)                            #=&gt; 45\n   # Same using a block and inject\n   (5..10).inject {|sum, n| sum + n }            #=&gt; 45\n   # Multiply some numbers\n   (5..10).reduce(1, :*)                         #=&gt; 151200\n   # Same using a block\n   (5..10).inject(1) {|product, n| product * n } #=&gt; 151200\n   # find the longest word\n   longest = %w{ cat sheep bear }.inject do |memo,word|\n      memo.length &gt; word.length ? memo : word\n   end\n   longest                                       #=&gt; &quot;sheep&quot;\n"
full_name: Enumerable#reduce
is_singleton: false
name: reduce
params: |
  enum.inject(initial, sym) => obj
  enum.inject(sym)          => obj
  enum.inject(initial) {| memo, obj | block }  => obj
  enum.inject          {| memo, obj | block }  => obj

visibility: public