San Francisco
August 27, 2013

Ruby Level 2: Blocks, Exceptions, and A Simple Webpage Scraper

This class is a followup to the introductory Ruby programming language course taught at Rails School. It will cover the basics of what blocks are, how errors are handled in Ruby, and exhibit some of these concepts in a simple webpage scraper.

In Level 2: Blocks, Exceptions and a Webpage Scraper, we will cover the following topics. This class assumes that:

Feel free to read ahead - we will cover the material in lessons 4 through 6 in the folder above.

Agenda

  • Blocks
    • How are blocks defined?
    • Typical usage of blocks
    • Relationship between Blocks and Methods
  • Exceptions
    • How Ruby represents errors
    • Syntax for specifying error handlers - rescue and ensure clauses
    • Common types of errors
    • The error hierarchy
  • A Simple Webpage Scraper
    • Downloading webpages: using OpenURI
    • Webpage structure: reading HTML
    • Finding a tag: using regular expressions
    • Putting it all together


7pm Pacific - 9pm Pacific on August 27, 2013 at Noisebridge
18 students were there

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