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2615 - String to number conversion with error trapping in Ruby
You've read in a string of text in Ruby - perhaps the user's input, or perhaps from a file. You know that string shoould contain a number - so you use the to_i method to do the conversion. But there's a problem - if the string doesn't start with a number, it won't convert correctly - it will jus ....

2614 - Neatly formatting results into a table
Would you like to produce a neat table of results, with the columns just wide enough to take the data? That sounds straightforward, but you can't output anything until you've looked through all the lines to see how long each of them will be. I was talking about this algorithm today, and this eveni ....

2613 - 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 ....

2612 - The Model, View, Controller architecture (MVC) - what, why and how.
You may have heard the "Model, View, Controller" mantra being bandied about, but what does it mean, why are some people so keen on it, and does it work? Where is it used? What does MVC (Model, View, Controller) really mean? It means that you divide your program / application into three areas. The ....

2611 - Sunday Evening, City of London
I'm training in London for the next few days, and travelled up late this afternoon. Even on a Sunday night, there are pictures to take. The course is a Ruby one ... I expect I'll get technical again tomorrow. ....

2610 - Cheat Sheet - what do you need for Ruby on Rails?
Here is a "cheat sheet" of the commands you might use to install Ruby, then Gems, then Rails, then get your first application and server running. 1. Ruby tar xf ruby-1.9.1-p376.tar.gz cd ruby-1.9.1-p376/ ./configure make make install Check installation: [root@easterton ruby-1.9.1-p376]# ruby -v ....

2609 - Scope of variables - important to Ruby on Rails
Yesterday's Ruby on Rails training day brought home just how important it is to ensure that your Ruby variables are correctly "scoped" - that you tell Ruby if they're to be local to the method in which they are defined, to be available to all methods that run on the same objects, to all objects of a ....

2608 - Search and replace in Ruby - Ruby Regular Expressions
"If you want to replace one part of a string by another in Ruby, you can use the sub method on your string object. The first parameter you give to the method is the string you want to replace, and the second is the string you want to replace it by." OK - that's the easy bit ... but what if .... I ....

2607 - Answers on Ruby on Rails
What is Ruby on Rails? Ruby on Rails is a clever way of programming your web server in Ruby - it allows you to have data in databases on your website and provide very easy access tothat data through a browser, allowing your customers to see the data and you staff to see it, alter it, and add more d ....

2606 - Sorting arrays and hashes in Ruby
In Ruby, you can use the sort method on an array to sort that array - but you cannot sort a hash. That's because of the techniques used within a hash to make it very fast to look up individual elements. So what do you do if you want to sort something like this: ? stuff = {"Steve" => "Kent", "Grah ....

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