collection 源代码
Collection层次结构中的根接口。Collection表示一组对象,这些对象也称为collection的元素。一些collection允许有重复的元素,而另一些则不允许。一些collection是有序的,而另一些则是无序的。
Making a collection read-only involves wrapping the collection in another object whose mutation methods all throw UnsupportedOpera…
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collection = [1, 2, 3, 4, 5] sum = 0 collection.each {|i| sum += i} sum # => 15 #--- col…
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