Home Accessibility Courses Twitter The Mouth Facebook Resources Site Map About Us Contact
 
Python and Tcl - public course schedule [here]
Private courses on your site - see [here]
Please ask about maintenance training for Perl, PHP, Lua, etc
 
Ruby collections and strings - some new examples

From yesterday's Ruby course - a whole set of new examples on Ruby collections - arrays (which are ordered lists) and hashes (which are unordered). In other words, you look somethng up in an array by its position number, whereas you look something up in a hash based on its unique key, and the way it's implemented, you cannot sort those keys - if you try, you get an array or arrays of two elements returned!

[example] - Sorting an array and iterating through it in various ways

[example] - Using an anonymous array to swap over two variables easily

[exampe] - Combining arrays with "and" and "or"

[example] - sorting a hash - (you can't, but this shows how to get the same effective result!)

[example] - multidimensional structures in Ruby - a hash or arrays in this case


Here are some other examples from yesterday too - string handling and exceptions:

[example] - lots of ways of defining and handling strings

[example] - cleaning up strings of text that are user input using string methods and regular expressions

[example] Using a constant to turn debug mode on and off - also a very good example of reading from and processing a file in Ruby

(written 2010-02-03)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
R106 - Input and Output in Ruby
  [4678] Expect with Ruby - a training example to get you started - (2016-05-18)
  [4499] Significant work - beyond helloworld in Ruby - (2015-05-27)
  [3429] Searching through all the files in or below a directory - Ruby, Tcl, Perl - (2011-09-09)
  [2974] Formatting your output - options available in Ruby - (2010-09-29)
  [2893] Exclamation marks and question marks on ruby method names - (2010-07-28)
  [2614] Neatly formatting results into a table - (2010-02-01)
  [2290] Opening and reading files - the ruby fundamentals - (2009-07-16)
  [1887] Ruby Programming Course - Saturday and Sunday - (2008-11-16)
  [1587] Some Ruby programming examples from our course - (2008-03-21)

R107 - Collections (Arrays and Hashes) in Ruby
  [4502] Reading and parsing a JSON object in Ruby - (2015-06-01)
  [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)
  [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)

R109 - Ruby - Strings and Regular Expressions
  [4549] Clarrissa-Marybelle - too long to really fit? - (2015-10-23)
  [4505] Regular Expressions for the petrified - in Ruby - (2015-06-03)
  [4388] Global Regular Expression matching in Ruby (using scan) - (2015-01-08)
  [3758] Ruby - standard operators are overloaded. Perl - they are not - (2012-06-09)
  [3621] Matching regular expressions, and substitutions, in Ruby - (2012-02-23)
  [3424] Divide 10000 by 17. Do you get 588.235294117647, 588.24 or 588? - Ruby and PHP - (2011-09-08)
  [2980] Ruby - examples of regular expressions, inheritance and polymorphism - (2010-10-02)
  [2623] Object Oriented Ruby - new examples - (2010-02-03)
  [2608] Search and replace in Ruby - Ruby Regular Expressions - (2010-01-31)
  [2295] The dog is not in trouble - (2009-07-17)
  [2293] Regular Expressions in Ruby - (2009-07-16)
  [1891] Ruby to access web services - (2008-11-16)
  [1875] What are exceptions - Python based answer - (2008-11-08)
  [1588] String interpretation in Ruby - (2008-03-21)
  [1305] Regular expressions made easy - building from components - (2007-08-16)
  [1195] Regular Express Primer - (2007-05-20)
  [987] Ruby v Perl - interpollating variables - (2006-12-15)
  [986] puts - opposite of chomp in Ruby - (2006-12-15)
  [970] String duplication - x in Perl, * in Python and Ruby - (2006-12-07)

R111 - Ruby - Exceptions.
  [4675] Exceptions in Ruby - throwing, catching and using - (2016-05-17)
  [4008] Reading and checking user inputs - first lessons - Ruby - (2013-02-17)
  [3433] Exceptions - a fail-safe way of trapping things that may go wrong - (2011-09-11)
  [3260] Ruby - a training example that puts many language elements together to demonstrate the whole - (2011-04-23)
  [3177] Insurance against any errors - Volcanoes and Python - (2011-02-19)
  [2622] Handling unusual and error conditions - exceptions - (2010-02-03)
  [2620] Direct access to object variable (attributes) in Ruby - (2010-02-02)
  [2615] String to number conversion with error trapping in Ruby - (2010-02-01)

R118 - Ruby Sources and Resources
  [3783] Load path, load and require in Ruby, and a change from 1.8 to 1.9 - (2012-06-24)
  [3622] Loading Ruby classes - where does Ruby look? - (2012-02-24)
  [3426] Automed web site testing scripted in Ruby using watir-webdriver - (2011-09-09)
  [2931] Syncronise - software, trains, and buses. Please! - (2010-08-22)
  [2610] Cheat Sheet - what do you need for Ruby on Rails? - (2010-01-31)
  [550] 2006 - Making business a pleasure - (2006-01-01)


Back to
Direct access to object variable (attributes) in Ruby
Previous and next
or
Horse's mouth home
Forward to
Handling unusual and error conditions - exceptions
Some other Articles
Both feet on the same pavement
Skyline and looking up in London
Ruby collections and strings - some new examples
Passing code to procedures and yield in Ruby
Comparing floating point numbers - a word of caution and a solution
Defining a static method - Java, Python and Ruby
4759 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, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96 at 50 posts per page


This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - 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).

You can Add a comment or ranking to this page

© WELL HOUSE CONSULTANTS LTD., 2019: 404 The Spa • Melksham, Wiltshire • United Kingdom • SN12 6QL
PH: 01225 708225 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho

PAGE: http://www.wellho.net/mouth/2621_Rub ... mples.html • PAGE BUILT: Sat May 27 16:49:10 2017 • BUILD SYSTEM: WomanWithCat