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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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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))
Constants in Ruby

If you want to have a read only variable in Ruby, start its name with a capital letter (and you may like to go with a convention of using capitals right through the variable name).

Note that a Ruby constant - a name starting with a capital - hasa global scope, just like a variable name that starts with a $

There's an example [here] from today's Learning to Program in Ruby Training Course.

(written 2010-02-01)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
R110 - Ruby - Special Variables and Pseudo-Variables
  [990] Ruby - Totally Topical - (2006-12-16)
  [1586] Variable types in Ruby - (2008-03-21)
  [1587] Some Ruby programming examples from our course - (2008-03-21)
  [1891] Ruby to access web services - (2008-11-16)
  [2296] Variable scope - what is it, and how does it Ruby? - (2009-07-18)
  [2623] Object Oriented Ruby - new examples - (2010-02-03)
  [3757] Ruby - a teaching example showing many of the language features in short but useful program - (2012-06-09)
  [4502] Reading and parsing a JSON object in Ruby - (2015-06-01)
  [4682] One line scripts - Awk, Perl and Ruby - (2016-05-20)

R103 - Basic Ruby Language Elements
  [986] puts - opposite of chomp in Ruby - (2006-12-15)
  [2287] Learning to program in Ruby - examples of the programming basics - (2009-07-15)
  [2617] Comparing floating point numbers - a word of caution and a solution - (2010-02-01)
  [3278] Do I need to initialise variables - programming in C, C++, Perl, PHP, Python, Ruby or Java. - (2011-05-05)
  [3430] Sigils - the characters on the start of variable names in Perl, Ruby and Fortran - (2011-09-10)
  [3758] Ruby - standard operators are overloaded. Perl - they are not - (2012-06-09)
  [3917] BODMAS - the order a computer evaluates arithmetic expressions - (2012-11-09)
  [4324] Learning to program - variables and constants - (2014-11-22)
  [4369] Ruby - the second rung of learning the language - (2014-12-28)
  [4504] Where does Ruby load modules from, and how to load from current directory - (2015-06-03)


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Some other Articles
Defining a static method - Java, Python and Ruby
String to number conversion with error trapping in Ruby
Neatly formatting results into a table
Constants in Ruby
The Model, View, Controller architecture (MVC) - what, why and how.
Sunday Evening, City of London
Cheat Sheet - what do you need for Ruby on Rails?
Scope of variables - important to Ruby on Rails
Search and replace in Ruby - Ruby Regular Expressions
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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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