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Learning to program in Ruby - examples of the programming basics

We so often overlook the basics of programming, and yet they are so fundamental to good code - understanding things like how widely variables can be seen (also known as variable scope), what happens when you divide two numbers (do you get a decimal result or is the remainder thrown away), and how do you name a block of code and re-use it to avoid having to duplicate code and later maintainance work.

On yesterday's Ruby course, I produced a series of example of many of the basics and I have uploaded them on to our web site for you to take a look through if you wish. I have tried to avoid the temptation of "I'll just add something to show xxx" in these examples - the wood should not get lost in the trees!

[link] Prompt, read from user, calculate, output in Ruby

[link] Use of intermediate variables

[link] Use of intermediate variables - alternative

[link] Easier output formatting

[link] Calculations within double quotes

[link] if, elsif and else illustrated

[link] while, until and for loops - comparison

[link] finding extreme values from a collection

[link] Summing a collection

[link] Putting common code in a name block (function)

[link] Define class, create and use instances of it

[link] Use of 'self' in Ruby

[link] Calling program to access class in another file ...

[link] ... and that sample class in its own file

We offer two public Ruby courses - Learning to program in Ruby for newcomers to programming, and Ruby Programming for those with prior programming experience in another language. Public courses run at our Well House Manor training centre in Melksham, Wiltshire, England. These are niche courses - we offer residential facilities to full hotel standard, and can help with delegates travel arrangements too.
(written 2009-07-15)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
R101 - Ruby - Introduction
  [4498] Ruby - where one statement ends and the next begins - (2015-05-26)
  [4369] Ruby - the second rung of learning the language - (2014-12-28)
  [2607] Answers on Ruby on Rails - (2010-01-30)
  [2286] New to programming? It is natural (but needless) for you to be nervous - (2009-07-14)
  [1887] Ruby Programming Course - Saturday and Sunday - (2008-11-16)
  [1375] Python v Ruby - (2007-10-02)
  [1302] Ruby, Ruby, Ruby. Rails, Rails, Rails. - (2007-08-13)
  [1041] Learnt in London - Ruby, Martini, Coral and the Core - (2007-01-17)
  [1027] Cue the music, I'm happy. - (2007-01-09)
  [664] Ruby course - oops - it's not happening - (2006-04-01)
  [550] 2006 - Making business a pleasure - (2006-01-01)

R102 - Hello Ruby Objects
  [4673] Separating detailed data code from the main application - Ruby example - (2016-05-16)
  [4581] Thin application, thick objects - keep you main code simple. Example in Ruby - (2015-11-21)
  [4580] Easy example - data record to object and object to data record mapping in Ruby - (2015-11-21)
  [4009] Clear, concise examples - Ruby classes and objects. - (2013-02-17)
  [2603] Ruby objects - a primer - (2010-01-29)

R103 - Basic Ruby Language Elements
  [4504] Where does Ruby load modules from, and how to load from current directory - (2015-06-03)
  [4324] Learning to program - variables and constants - (2014-11-22)
  [3917] BODMAS - the order a computer evaluates arithmetic expressions - (2012-11-09)
  [3758] Ruby - standard operators are overloaded. Perl - they are not - (2012-06-09)
  [3430] Sigils - the characters on the start of variable names in Perl, Ruby and Fortran - (2011-09-10)
  [3278] Do I need to initialise variables - programming in C, C++, Perl, PHP, Python, Ruby or Java. - (2011-05-05)
  [2617] Comparing floating point numbers - a word of caution and a solution - (2010-02-01)
  [2613] Constants in Ruby - (2010-02-01)
  [2296] Variable scope - what is it, and how does it Ruby? - (2009-07-18)
  [986] puts - opposite of chomp in Ruby - (2006-12-15)

R104 - Ruby - Control Structures
  [4674] Alternating valuses / flip-flop / toggle - example in Ruby - (2016-05-17)
  [4503] Separating your code for easier testing, understanding and re-use; example in Ruby - (2015-06-02)
  [4402] Finding sum, minimum, maximum and average in Python (and Ruby) - (2015-01-19)
  [4370] Conditionals, loops and methods in Ruby - a primer with simple examples - (2014-12-29)
  [4323] Learning to program - Loop statements such as while - (2014-11-22)
  [4322] Learning to Program - the conditional statement (if) - (2014-11-21)
  [3769] Muttable v immutable and implications - Ruby - (2012-06-20)
  [3620] Finding the total, average, minimum and maximum in a program - (2012-02-22)
  [3619] Ruby v Perl - a comparison example - (2012-02-21)
  [3422] Assigning values to variables within other statements - Ruby - (2011-09-07)
  [3397] Does a for loop evaluate its end condition once, or on every iteration? - (2011-08-18)
  [3254] Multiple inputs, multiple out, ruby functions - (2011-04-19)
  [3253] Is this number between? Does this list include? - Ruby - (2011-04-18)
  [3200] How a for loop works Java, Perl and other languages - (2011-03-12)
  [3159] Returning multiple values from a function call in various languages - a comparison - (2011-02-06)
  [3158] Ruby training - some fresh examples for string handling applications - (2011-02-05)
  [3156] Splitting data reading code from data processing code - Ruby - (2011-02-04)
  [2975] Why do I need brackets in Ruby ... or Perl, Python, C or Java - (2010-09-29)
  [2892] Alternative loops and conditionals in Ruby and Perl - (2010-07-28)
  [2711] For loop - checked once, or evety time? Ruby v Perl comparison and contrast - (2010-04-07)
  [2619] Passing code to procedures and yield in Ruby - (2010-02-02)
  [2471] A short form of if ... then ... else - (2009-10-23)
  [1904] Ruby, Perl, Linux, MySQL - some training notes - (2008-11-23)
  [1891] Ruby to access web services - (2008-11-16)
  [1870] What to do with a huge crop of apples - (2008-11-04)
  [1738] Clean code, jump free (Example in Lua) - (2008-08-06)
  [1696] Saying NOT in Perl, PHP, Python, Lua ... - (2008-07-04)
  [1587] Some Ruby programming examples from our course - (2008-03-21)
  [1582] Ruby, C, Java and more - getting out of loops - (2008-03-19)
  [1220] for loop - how it works (Perl, PHP, Java, C, etc) - (2007-06-06)
  [1163] A better alternative to cutting and pasting code - (2007-04-26)
  [995] Ruby's case - no break - (2006-12-17)
  [985] Equality in Ruby - == eql? and equal? - (2006-12-14)
  [962] Breaking a loop - Ruby and other languages - (2006-12-03)
  [960] 1st, 2nd, 3rd revisited in Ruby - (2006-12-02)


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Collection objects (array and hash) in Ruby
Opening and reading files - the ruby fundamentals
pre-Inaugural briefing - Melksham Community Area Partnership
Wiltshire Community Area Partnerships
Learning to program in Ruby - examples of the programming basics
Great new diagrams for our notes ... Python releases
Strings as collections in Python
Everyone is in the customer relations business
Checking robots.txt from Python
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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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