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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, 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
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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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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