Higher-Order Perl

Chapter 4: Iterators

Table of Contents

1. Introduction
   1. Filehandles are Iterators
   2. Iterators are Objects
   3. Other Common Examples of Iterators
2. Homemade iterators
   1. A Trivial Iterator: upto
      • Syntactic Sugar for Manufacturing Iterators
   2. dir_walk
   3. On Clever Inspirations
3. Examples
   1. Permutations
   2. Genomic Sequence Generator
   3. Filehandle Iterators
   4. A Flat-File Database
      • Improved Database
   5. Searching Databases Backwards
      1. A Query Package that Transforms Iterators
      2. An Iterator that Reads Files Backwards
      3. Putting it Together
   6. Random Number Generation
4. Filters and Transforms
   1. imap
   2. igrep
   3. list_iterator
   4. append
5. The Semipredicate Problem
   1. Avoiding the Problem
   2. Alternative undefs
   3. Rewriting Utilities
   4. Iterators That Return Multiple Values
   5. Explicit Exhaustion Function
   6. Four-Operation Iterators
   7. Iterator Methods
6. Alternative Interfaces to Iterators
   1. Using foreach to Loop Over More Than One Array
   2. An Iterator with an each-like Interface
   3. Tied Variable Interfaces
      1. Summary of tie
      2. Tied Scalars
      3. Tied Filehandle
7. An Extended Example: Web Spiders
   1. Pursuing only Interesting Links
   2. Referring URLs
   3. robots.txt
   4. Summary

22575 words / 71 pages. (Last update Sun Nov 7 23:38:54 2004)

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