tailieunhanh - Higher-Order Perl

Most Perl programmers were originally trained as C and Unix programmers, so the Perl programs that they write bear a strong resemblance to C programs. However, Perl incorporates many features that have their roots in other languages such as Lisp. These advanced features are not well understood and are rarely used by most | I I Praise for Higher-Order Perl. . . As a programmer your bookshelf is probably overflowing with books that did nothing to change the way you program. or think about programming. You re going to need a completely different shelf for this book. While discussing caching techniques in Chapter 3 Mark Jason Dominus points out how a large enough increase in power can change the fundamental way you think about a technology. And that s precisely what this entire book does for Perl. It raids the deepest vaults and highest towers of Computer Science and transforms the many arcane treasures it finds recursion iterators filters memoization partitioning numerical methods higher-order functions currying cutsorting grammar-based parsing lazy evaluation and constraint programming into powerful and practical tools for real-world programming tasks file system interactions HTML processing database access web spidering typesetting mail processing home finance text outlining and diagram generation. Along the way it also scatters smaller but equally invaluable gems like the elegant explanation of the difference between scope and duration in Chapter 3 or the careful exploration of how best to return error flags in Chapter 4. It even has practical tips for Perl evangelists. Dominuspresents even the most complex ideas in simple comprehensible ways but never compromises on the precision and attention to detail for which he is so widely and justly admired. His writing is as always lucid eloquent witty and compelling. Aptly named this truly is a Perl book of a higher order and essential reading for every serious Perl programmer. Damian Conway Co-designer of Perl 6 I HIGHER-ORDER .