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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
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
R118 - Ruby Sources and Resources
  [550] 2006 - Making business a pleasure - (2006-01-01)
  [2610] Cheat Sheet - what do you need for Ruby on Rails? - (2010-01-31)
  [2931] Syncronise - software, trains, and buses. Please! - (2010-08-22)
  [3426] Automed web site testing scripted in Ruby using watir-webdriver - (2011-09-09)
  [3435] Sorta sorting a hash, and what if an exception is NOT thrown - Ruby - (2011-09-12)
  [3622] Loading Ruby classes - where does Ruby look? - (2012-02-24)
  [3783] Load path, load and require in Ruby, and a change from 1.8 to 1.9 - (2012-06-24)

R111 - Ruby - Exceptions.
  [1875] What are exceptions - Python based answer - (2008-11-08)
  [2615] String to number conversion with error trapping in Ruby - (2010-02-01)
  [2620] Direct access to object variable (attributes) in Ruby - (2010-02-02)
  [2622] Handling unusual and error conditions - exceptions - (2010-02-03)
  [3177] Insurance against any errors - Volcanoes and Python - (2011-02-19)
  [3260] Ruby - a training example that puts many language elements together to demonstrate the whole - (2011-04-23)
  [3433] Exceptions - a fail-safe way of trapping things that may go wrong - (2011-09-11)
  [4008] Reading and checking user inputs - first lessons - Ruby - (2013-02-17)
  [4675] Exceptions in Ruby - throwing, catching and using - (2016-05-17)

R109 - Ruby - Strings and Regular Expressions
  [970] String duplication - x in Perl, * in Python and Ruby - (2006-12-07)
  [986] puts - opposite of chomp in Ruby - (2006-12-15)
  [987] Ruby v Perl - interpollating variables - (2006-12-15)
  [1195] Regular Express Primer - (2007-05-20)
  [1305] Regular expressions made easy - building from components - (2007-08-16)
  [1588] String interpretation in Ruby - (2008-03-21)
  [1887] Ruby Programming Course - Saturday and Sunday - (2008-11-16)
  [1891] Ruby to access web services - (2008-11-16)
  [2293] Regular Expressions in Ruby - (2009-07-16)
  [2295] The dog is not in trouble - (2009-07-17)
  [2608] Search and replace in Ruby - Ruby Regular Expressions - (2010-01-31)
  [2614] Neatly formatting results into a table - (2010-02-01)
  [2623] Object Oriented Ruby - new examples - (2010-02-03)
  [2980] Ruby - examples of regular expressions, inheritance and polymorphism - (2010-10-02)
  [3424] Divide 10000 by 17. Do you get 588.235294117647, 588.24 or 588? - Ruby and PHP - (2011-09-08)
  [3621] Matching regular expressions, and substitutions, in Ruby - (2012-02-23)
  [3757] Ruby - a teaching example showing many of the language features in short but useful program - (2012-06-09)
  [3758] Ruby - standard operators are overloaded. Perl - they are not - (2012-06-09)
  [4388] Global Regular Expression matching in Ruby (using scan) - (2015-01-08)
  [4505] Regular Expressions for the petrified - in Ruby - (2015-06-03)
  [4549] Clarrissa-Marybelle - too long to really fit? - (2015-10-23)

R107 - Collections (Arrays and Hashes) in Ruby
  [991] Adding a member to a Hash in Ruby - (2006-12-16)
  [2291] Collection objects (array and hash) in Ruby - (2009-07-16)
  [2606] Sorting arrays and hashes in Ruby - (2010-01-30)
  [2618] What are Ruby Symbols? - (2010-02-02)
  [2976] Creating, extending, traversing and combining Ruby arrays - (2010-09-30)
  [3253] Is this number between? Does this list include? - Ruby - (2011-04-18)
  [3255] Process every member of an array, and sort an array - Ruby - (2011-04-21)
  [3257] All possible combinations from a list (Python) or array (Ruby) - (2011-04-23)
  [4368] Shuffling a list - Ruby and Python - (2014-12-28)
  [4499] Significant work - beyond helloworld in Ruby - (2015-05-27)
  [4502] Reading and parsing a JSON object in Ruby - (2015-06-01)

R106 - Input and Output in Ruby
  [1587] Some Ruby programming examples from our course - (2008-03-21)
  [2290] Opening and reading files - the ruby fundamentals - (2009-07-16)
  [2893] Exclamation marks and question marks on ruby method names - (2010-07-28)
  [2974] Formatting your output - options available in Ruby - (2010-09-29)
  [3429] Searching through all the files in or below a directory - Ruby, Tcl, Perl - (2011-09-09)
  [4678] Expect with Ruby - a training example to get you started - (2016-05-18)


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Direct access to object variable (attributes) in Ruby
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Horse's mouth home
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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
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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.

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