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Collection objects (array and hash) in Ruby

Ruby has two collection objects - Arrays (where you access elements based on their numeric position) and hashes (where you can access elements based on a key, rarely numeric). That's similar in all but name to many other languages, although the names may be different (arrays or lists; hashes or dictionaries or associative arrays!). We covered many of the basics on yesterday's learning to program in Ruby course - and here are the sample programs I wrote as an illustration during the Arrays and Hashes section:

[link] Arrays, and iterating through them

[link] Array methods such as grep

[link] Simulated table (an array of arrays)

[link] Set up a hash and use it

[link] Simple but practical hash example

[link] Count the number of visits from each IP address (Includes how to sort a hash - or rather the keys - based on the values the hash contains in Ruby)
(written 2009-07-16)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
R107 - Collections (Arrays and Hashes) in Ruby
  [4502] Reading and parsing a JSON object in Ruby - (2015-06-01)
  [4499] Significant work - beyond helloworld in Ruby - (2015-05-27)
  [4368] Shuffling a list - Ruby and Python - (2014-12-28)
  [3757] Ruby - a teaching example showing many of the language features in short but useful program - (2012-06-09)
  [3435] Sorta sorting a hash, and what if an exception is NOT thrown - Ruby - (2011-09-12)
  [3257] All possible combinations from a list (Python) or array (Ruby) - (2011-04-23)
  [3255] Process every member of an array, and sort an array - Ruby - (2011-04-21)
  [3253] Is this number between? Does this list include? - Ruby - (2011-04-18)
  [2976] Creating, extending, traversing and combining Ruby arrays - (2010-09-30)
  [2621] Ruby collections and strings - some new examples - (2010-02-03)
  [2618] What are Ruby Symbols? - (2010-02-02)
  [2606] Sorting arrays and hashes in Ruby - (2010-01-30)
  [991] Adding a member to a Hash in Ruby - (2006-12-16)


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Object Orientation in Ruby - intermediate examples
Collection objects (array and hash) in Ruby
Opening and reading files - the ruby fundamentals
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Learning to program in Ruby - examples of the programming basics
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