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Message: [QUOTE="Peter J. Holzer, post: 4872218"] I don't know about the theory, but in practice a REPL makes debugging easier because you can interactively test your code. This is especially powerful if it is combined with a debugger. The Perl debugger is a primitive REPL (well, only a REL, you have to P yourself), so you may already have used some of its features (like invoking functions or evaluating arbitrarily complex expressions) and take them for granted, but if you've ever used a debugger which didn't have the ability or had to work without any debugger you'll appreciate it (of course you can always write test programs which do the same thing, but that takes more time). hp [/QUOTE]