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4580 - Easy example - data record to object and object to data record mapping in Ruby
From the Ruby course just finished - an example of an application that reads through a data file, passes comments through unaltered, converts valid data lines into objects which it updates and writes back in place. The whole busisness of mapping data records to objects and objects back to data reco ....

4579 - Behaviour and test driven development in Ruby using RSpec
RSpec is a Test / Behaviourish Driven Development Gem for Ruby that you'll commonly find used in associaition with Rails, Gherkin, Cucumber, Watir, Selenium, Capybara ... but it can also be used stand alone. One of the big problems of starting to use it stand alone is to find an example which doesn ....

4578 - Rail electrification - far, far too optimistic so over budget and late
Select Committee report [here]. What the papers are saying via [here]. My own summary - A combination of Network Rail, the Department for Transport and the Office of Road and Rail are criticised by a select committee of MPs for getting the rail infrastructure program to upgrade the Great Western ....

4577 - An update - Melksham Link Canal and river
14th November 2015 - an update to my Canal through Melksham article written some 5 years ago, prompted by a visit from an interested party, and bumping into (and chatting with) another interested party on the train. Looking back five years, it's amazing how much has stood the test of time, and how ....

4576 - If it's Tuesday it must be Belgium?
It's been one of those "If it's Saturday it must be Bristol" type weekends and week starts ... except here I am just after midnight, early Wednesday morning in Swavesey, ready for a Python course starting tomorrow. Past days have been both Euphoric and tiring - with Railfuture awards on Saturday ( ....

4575 - Learning not just what a program does, but how to design it in the first place.
A Programming course is not only about how a language works, but also about teaching the delegates to to plan their applications and programming using that language to make best use of existing resources, to develop code that works well and can be re-used and updated as the requirements drift in the ....

4574 - repeat until in Lua - a one or more rather than a zero or more loop
The "repeat until" structure in Lua provides a loop with condition checking at the end - in other words, it's a "one or more times" loop, unlike while which is a "zero or more times" loop. Syntax - straightforward; example:   repeat     io.write("How many people? ") & ....

4573 - Classic style OO code - in Lua
Lua tables can hold not only data values, but also functions - those functions defining behaviours. See [here]. However, if you have a lot of tables (data items) all of which require the same code attached, that's not efficient and so you can set up a metatable - a subsidiary table of extra inform ....

4572 - Tables with values and code in Lua - looks like an object?
In Lua, we can use variables to hold both data and code, and we can use tables to hold groups of values (numbers and strings) and code assiciated with those variables too. A new example - [here] on our web site - shows how I can define such a table:   south = {cars=3,seats=78,time="06:38 ....

4571 - Lua - using modules to add your own utilities
Lua is a small language ... but that doesn't mean it lacks capabiities - it just means that you need to write some code yourself to implement simple utilities that you would cherry pick from huge libraries in other languages. For example from this week's course, I've written functions to split a li ....

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