New PDF release: Advanced Perl Programming

By Sriram Srinivasan

ISBN-10: 1565922204

ISBN-13: 9781565922204

Even if your wisdom of Perl is informal or deep, this publication will make you a extra comprehensive programmer. It covers complicated innovations for dealing with production-ready Perl courses and explains tools for manipulating facts and items which could have gave the impression of magic prior to. moreover, it units Perl within the context of a bigger atmosphere, giving you the historical past you would like for facing networks, databases, and GUIs. it's also a dialogue of internals that can assist you application extra successfully and embed Perl inside of C or C inside Perl. significant issues contain the sensible use of programs and periods (object-oriented programming), complicated facts constructions, patience (e.g., utilizing a database), networking, graphical interfaces utilizing the Tk toolkit, interplay with interval features, embedding and increasing the Perl interpreter, and chosen internals.

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You can safely skip this section without loss of continuity. [6] [6] This is true whether the variable is global, dynamically scoped (using local()), or lexically scoped (using my()). More details are given in Chapter 3. 3: A variable is a name and value pair An array or a hash is not just a collection of numbers or strings. 4 illustrates. 4 represents a distinct value. An array has one value that represents the collection of scalar values. Each element of the array is a distinct scalar value. This is analogous to a pride of lions being treated as a single entity (which is why we refer to it in the singular) that has properties distinct from those of the individual lion.

Given a category, print the year and title of all entries for that category. ● Print all entries sorted by category or by year. com/. 2. 2: Data structure to represent Oscar winners Each entry includes a category, a year, and the name of the corresponding winner. We choose to keep this information in an anonymous array (an anonymous hash would do just as well). The two indices %year_index and %category_index map the year and category to anonymous arrays containing references to the entries. txt") || die "Could not open database: $:"; %category_index = (); %year_index = (); while ($line = ) { chomp $line; ($year, $category, $name) = split (/:/, $line); create_entry($year, $category, $name) if $name; } sub create_entry { # create_entry (year, category, name) my($year, $category, $name) = @_; # Create an anonymous array for each entry $rlEntry = [$year, $category, $name]; # Add this to the two indices push (@{$year_index {$year}}, $rlEntry); # By Year push (@{$category_index{$category}}, $rlEntry); # By Category } Notice that each push statement does a fair bit of work.

Java and C++ have the class declaration to compose new data types out of fundamental data types. These constructs allow you to combine a bunch of named attributes under a single banner but still provide access to each individual attribute. 1. [1] We'll discuss a module called ObjectTemplate in Chapter 7, Object-Oriented Programming, that provides this. 1: Simulating C structures with Perl hashes Perl's implementation of hash tables is actually quite efficient in terms of both performance and space.

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Advanced Perl Programming by Sriram Srinivasan

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