http://www.wellho.net/horse/ Musing, events and thoughts from Graham Ellis en-us Copyright 2010 Mon, 08 Feb 2010 17:24:53 +0000 Mon, 08 Feb 2010 17:32:10 +0000 http://www.movabletype.org/?v=3.01D http://blogs.law.harvard.edu/tech/rss Delegates sometimes ask me what an "injection attack" is, and for examples. I came across a really good example this morning on (oops!) one of our own pages - it's now fixed, but I'm documenting here and showing you what... http://www.wellho.net/archives/2010/02/index.html#002628 http://www.wellho.net/archives/2010/02/index.html#002628 Mon, 08 Feb 2010 17:24:53 +0000 Fancy a day out with the family from Melksham to Oxford, to Swindon or to Didcot? We took a train trip on Saturday to Oxford from Melksham Station ... three adults and one dog - total return fare to... http://www.wellho.net/archives/2010/02/index.html#002627 http://www.wellho.net/archives/2010/02/index.html#002627 Sun, 07 Feb 2010 07:59:37 +0000 "Malachite" - Copper Carbonate. But know to me as a rather rich, bright, exotic green colour that's so bright and rich it's rarely seen. I moved to the south east of London in 1959, at a very young age -... http://www.wellho.net/archives/2010/02/index.html#002626 http://www.wellho.net/archives/2010/02/index.html#002626 Sat, 06 Feb 2010 20:41:40 +0000 Wednesday Morning 08:30, February, Moorgate, London. I'm fascinated by some people who feel that the rules don't apply to them. The guy I just had to walk past, bathed in a cloud of smoke of the almost-enclosed lobby with its... http://www.wellho.net/archives/2010/02/index.html#002625 http://www.wellho.net/archives/2010/02/index.html#002625 Fri, 05 Feb 2010 06:32:03 +0000 For those readers who feel I have a one track (Ruby) mind this week - here are a couple of pictures. This first taken out of the bedroom of the hotel I was in Sunday through Tuesday evenings (I've move... http://www.wellho.net/archives/2010/02/index.html#002624 http://www.wellho.net/archives/2010/02/index.html#002624 Thu, 04 Feb 2010 08:59:17 +0000 We had an "object oriented Ruby" morning on today's course. "But everything's an object in Ruby" you'll tell me and you're sort of right (we could argue about what symbols and code blocks are), but there are certain elements of... http://www.wellho.net/archives/2010/02/index.html#002623 http://www.wellho.net/archives/2010/02/index.html#002623 Wed, 03 Feb 2010 23:01:43 +0000 "I can't answer that question in the way you expect" ... that's something that may be said to you occasionally - you ask someone what suit a playing card is that they're holding and they cannot tell you because it... http://www.wellho.net/archives/2010/02/index.html#002622 http://www.wellho.net/archives/2010/02/index.html#002622 Wed, 03 Feb 2010 22:47:41 +0000 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... http://www.wellho.net/archives/2010/02/index.html#002621 http://www.wellho.net/archives/2010/02/index.html#002621 Wed, 03 Feb 2010 07:28:50 +0000 Rather than writing getters and setters, in many Object Oriented languages you can access the variables within an object directly. That can be dangerous for code flexibility for the future, as it means that you're removing the possibility of interspersing... http://www.wellho.net/archives/2010/02/index.html#002620 http://www.wellho.net/archives/2010/02/index.html#002620 Tue, 02 Feb 2010 07:45:04 +0000 http://www.wellho.net/archives/2010/02/index.html#002619 http://www.wellho.net/archives/2010/02/index.html#002619 Tue, 02 Feb 2010 07:42:53 +0000 Ruby Symbols are names that follow a : character. They're a quick way of getting at data, where (for example) you have a fixed key or name in a hash, and you'll find them commonly used in many definitions such... http://www.wellho.net/archives/2010/02/index.html#002618 http://www.wellho.net/archives/2010/02/index.html#002618 Tue, 02 Feb 2010 07:33:24 +0000 "Think of a number between 5 and 15. Double it. Add fourteen. Halve it. Take away the number you first thought of. Is the result 7?" We all played games like that as children, thinking of the number 0 ourselves... http://www.wellho.net/archives/2010/02/index.html#002617 http://www.wellho.net/archives/2010/02/index.html#002617 Mon, 01 Feb 2010 22:56:38 +0000 Most methods in classes that your write will be run on / applied to individual objects within that class - you'll be asking for the colour of a marker pen, or setting the price of a hotel room. You will... http://www.wellho.net/archives/2010/02/index.html#002616 http://www.wellho.net/archives/2010/02/index.html#002616 Mon, 01 Feb 2010 22:31:24 +0000 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... http://www.wellho.net/archives/2010/02/index.html#002615 http://www.wellho.net/archives/2010/02/index.html#002615 Mon, 01 Feb 2010 22:28:56 +0000 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... http://www.wellho.net/archives/2010/02/index.html#002614 http://www.wellho.net/archives/2010/02/index.html#002614 Mon, 01 Feb 2010 22:09:28 +0000