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Some of the example files can be run as scripts using the scala command. Others must be compiled into class files. Some files contain deliberate errors and won’t compile. We have adopted a file naming convention to indicate each of these cases, although as you learn Scala it should become obvious from the contents of the files, in most cases.
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Can you also please add a section on who the target audience for the book is? E.g. experienced Java programmer etc.
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