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"]
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"
indian.push "The Palace on Wheels"
indian << "Sultan"
indian = "Goa"
indian += ["Amritsar Star"]
indian[indian.length] = "The Curry House"
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 articlesR107 - Collections (Arrays and Hashes) in Ruby 
Ruby - a teaching example showing many of the language features in short but useful program - (2012-06-09) 
Sorta sorting a hash, and what if an exception is NOT thrown - Ruby - (2011-09-12) 
All possible combinations from a list (Python) or array (Ruby) - (2011-04-23) 
Process every member of an array, and sort an array - Ruby - (2011-04-21) 
Is this number between? Does this list include? - Ruby - (2011-04-18) 
Ruby collections and strings - some new examples - (2010-02-03) 
What are Ruby Symbols? - (2010-02-02) 
Sorting arrays and hashes in Ruby - (2010-01-30) 
Collection objects (array and hash) in Ruby - (2009-07-16) 
Adding a member to a Hash in Ruby - (2006-12-16)
Some other Articles
Ruby - examples of regular expressions, inheritance and polymorphism Ruby - yield; parallel routinesChristmas 2010 - Well House Manor, Melksham, HotelWhat is a factory method and why use one? - Example in RubyCreating, extending, traversing and combining Ruby arraysWhy do I need brackets in Ruby ... or Perl, Python, C or JavaFormatting your output - options available in RubyLearning to program - where to start if you have never programmed beforeSome more advanced Perl examples from a recent courseShould the public sector compete with businesses? and other deep questions
4280 posts, page by page
Link to page ... 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86 at 50 posts per page
This is a page archived from The Horse's Mouth at
the diary and writings of Graham Ellis.
Every attempt was made to provide current information at the time the
page was written, but things do move forward in our business - new software
releases, price changes, new techniques. Please check back via
our main site for current courses,
prices, versions, etc - any mention of a price in "The Horse's Mouth"
cannot be taken as an offer to supply at that price.
Link to Ezine home page (for reading).
Link to Blogging home page (to add comments).