Download E-books Mastering Perl PDF

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By brian d foy

Take your next step towards Perl mastery with complicated strategies that make coding more uncomplicated, upkeep easier, and execution speedier. Mastering Perl isn't really a suite of smart tips, yet a fashion of wondering Perl programming for fixing debugging, configuration, and lots of different real-world difficulties you’ll stumble upon as a operating programmer.

The 3rd in O’Reilly’s sequence of landmark Perl tutorials (after Learning Perl and Intermediate Perl), this absolutely upated version pulls every little thing jointly and is helping you bend Perl in your will.

  • Explore complex commonplace expressions features
  • Avoid universal difficulties while writing safe programs
  • Profile and benchmark Perl courses to work out the place they wish work
  • Wrangle Perl code to make it extra presentable and readable
  • Understand how Perl retains music of package deal variables
  • Define subroutines at the fly
  • Jury-rig modules to mend code with out enhancing the unique source
  • Use bit operations and bit vectors to shop huge facts efficiently
  • Learn how one can observe error that Perl doesn’t report
  • Dive into logging, facts patience, and the magic of tied variables

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Pair. com/ comdog/Articles/Die_and_the_Web. txt. I speak extra approximately Hook::LexWrap in “Wrapping Subroutines” within the July 2005 factor of The Perl magazine. the thing initially seemed within the Perl magazine and now looks within the “Lightweight Languages” part on Dr. Dobb’s magazine on-line: http:// www. ddj. com/dept/lightlang/184416218. The perform of Programming by way of Brian W. Kernighan and Rob Pike (Addison-Wesley) discusses their method of debugging. even supposing this isn’t a Perl publication, it rather doesn’t must be approximately any language. It’s sensible suggestion for any kind of programming. additional examining | sixty seven CHAPTER five Profiling Perl earlier than i will do something to enhance my courses, i need to decide approximately what i'll repair. sooner than I spend the time to do this, i need to determine what I should still specialise in. How do i am getting the main development for the smallest amount of fiddling? What should still I paintings on first? throughout the strategy of profiling, through which I checklist and summarize what a software is doing, i will make these judgements. fortunately, Perl already bargains numerous instruments to do that. discovering the offender i need to compute a factorial. It’s the previous observed of functionality discussions, and I’ll get to whatever extra fascinating in a second. whilst I Googled for “factorial subroutines,” virtually each implementation (aside from these in meeting language) was once a recursive set of rules, that means subroutine needed to determine a part of the matter, then name itself with a subproblem, and continue doing that until eventually there are not any extra subproblems, finally operating its manner as much as the unique name. Here’s how I’d write that during Perl: #! /usr/bin/perl # factorial-recurse. pl sub factorial { go back except int( $_[0] ) == $_[0]; go back 1 if $_[0] == 1; go back $_[0] * factorial( $_[0] - 1 ); } print factorial( $ARGV[0] ), "\n"; Now i need to determine find out how to increase this toy application. It’s already beautiful quickly simply because Perl can’t actually matter that top. With something over a hundred and seventy, my application on my computing device returns Inf (more on that during a moment). regardless of that, I’ll profile it besides. i exploit the Devel::SmallProf module to get a brief precis. I invoke it with the -d swap, which already assumes the Devel part of the identify (see bankruptcy 4): sixty nine % perl -d:SmallProf factorial. pl one hundred seventy The Devel::SmallProf module leaves at the back of a human-readable textual content dossier named smallprof. out. In its columnar output, it indicates every one line of this system, what number instances I completed that line, and the genuine and CPU occasions for every line: ================ SmallProf model 1. 15 ========================= Profile of factorial. pl web page 1 ================================================================= count number wall tm cpu time line zero zero. 000000 zero. 000000 1:#! /usr/bin/perl zero zero. 000000 zero. 000000 2: one hundred seventy zero. 000000 zero. 000000 3:sub factorial { one hundred seventy zero. 001451 zero. 000000 four: go back until int( $_[0] ) == $_[0]; one hundred seventy zero. 004367 zero. 000000 five: go back 1 if $_[0] == 1; 169 zero. 004371 zero. 000000 6: go back $_[0] * factorial( $_[0] - 1 ); zero zero. 000000 zero. 000000 7: } zero zero. 000000 zero. 000000 eight: 1 zero. 000009 zero.

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