| http://www.w3.org/ns/prov#value | - In Ruby, everything is an object, that is, the number -99 is the object, taking the absolute value of such an operation should belong to the figure itself, so Ruby's approach is to: c =-99.abs In Ruby, you are the object of all operations, results of operations is also an object. ?? 3.1 Class definition class is to have the same properties and behavior of the object as an abstract, Ruby in the cla
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