Peter J. Scott, Ed Wright's Perl Debugged PDF

By Peter J. Scott, Ed Wright

ISBN-10: 0201700549

ISBN-13: 9780201700541

(Pearson schooling) Saves programmers time and frustration by way of providing a consultant in the course of the complete programming method, displaying the right way to thoroughly debug Perl. instance wealthy and somewhat funny, the reference and consultant minimizes the advance, troubleshooting, and upkeep time builders needs to take to create based, errorless code. Softcover.

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Sample text

1 Dumping Your Data That is all well and good for scalars and arrays, but it won't even handle hashes, let alone complex lists of lists. ] Note that we passed a reference to the hash we were examining to Dumper. ). By passing a reference to %state, Dumper sees just the one variable, a reference to a hash, and can format its output as keys and associated values. Dumper can also detect references it has previously followed and thus minimize the size of the output necessary (and avoid problems with circular references).

The first argument will therefore be interpreted in scalar context. And the first (and only) argument we passed in our example was @arglist, which in a scalar context yields the number of elements in the array: 4. "Okay," you say, licking your wounds but determined to come back fighting, "so why didn't the same problem occur with printf? " The difference is that printf wasn't given the same internal prototype. ) But in the case of printf, you couldn't write a prototype for it yourself if your life depended on it, because printf can take a filehandle as a special kind of first argument: printf STDOUT "The answer is %d\n", 42; Note there's no comma after it!

Use constant DEBUG => 1; # later that same program... warn "***DEBUG*** Tax rate = $tax_rate\n" if DEBUG; Note that we made DEBUG a constant so it doesn't accidentally get overwritten elsewhere. With enough such warn statements in your code the Laziness Principle will assert itself: use constant DEBUG => 1; sub dbgprt (@); # code ... dbgprt "$. lines in input file\n"; # more code ... sub dbgprt (@) { warn "***DEBUG*** ", @_ if DEBUG; } Now we've abstracted all the functionality we might want to change about our tracing statements (what marker text they use, how to decide whether to print them, what output function they use) into one place where we need to change it only once.

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Perl Debugged by Peter J. Scott, Ed Wright

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