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Creating, extending, traversing and combining Ruby arrays

Ruby shares many of its eclecticism's with Perl - lots of ways of doing the same thing, though it doesn't go quite so far (some would say so far beyond the reasonable) as Perl does. So when you come to create or manipulate an array (really an ordered list) there's a big choice.
  indian = ["Refa","Melksham Tandoori","Broughton Balti"]
or
  alternatives = %w(Lee's McDonalds Subway Grapes)
quite apart from a wide range of methods that will set up an array.

When you come to add something on to the end of an array, there's even more variety:
  indian.push "Taj Mahal"
or
  indian.push "The Palace on Wheels"
or
  indian << "Sultan"
or
  indian[6] = "Goa"
or
  indian += ["Amritsar Star"]
or
  indian[indian.length] = "The Curry House"
or
  indian += alternatives

And when you come to iterate through it - well - have a look at the source of an example I've posted [here].

Once you've got a number of arrays, how can you combine them / manipulate them? Ruby's built in operators, running on array, can be used to and them (with &) and or them (with |) - allowing you to create a new array that contains only members that are common to both incoming arrays, or to create a new array that contains a members of both arrays combined, but eliminating the duplicate copy of members that appear in both. There's an example [here].
(written 2010-09-30, updated 2010-10-01)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
R107 - Collections (Arrays and Hashes) in Ruby
  [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)
  [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)
  [2291] Collection objects (array and hash) in Ruby - (2009-07-16)
  [991] Adding a member to a Hash in Ruby - (2006-12-16)


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