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4680 - Processing data line by line - iterator in Ruby with yield
If you have a big file / flow of data in Ruby, you probably don't want to read it all in to an array before you do any processing. Not only would that mean you couldn't produce any output until you have read all the data, but it would also make for a big process - probably inefficient, possibly doi ....

4679 - Reading in XML in Ruby with xmlsimple
The xmlsimple Ruby gem allows you to load in a file (or IO handle object or string) of XML as a multidimensional collection - hashes of arrays of hashes. There's a sample program here which includes this code to load the data from after __END__:   require 'xmlsimple'   info = ....

4678 - Expect with Ruby - a training example to get you started
The Expect library, originally written for use wth Tcl, is also available in other languages and today I wrote an example to introduce how it's used in Ruby. Please note this is a spike solution - not going to fail (if it does) in a pretty way. The principle of expect is that you spawn a process - ....

4677 - Swindon, Chippenham and Melksham - day trips by train to Weymouth start for 2016
Last Sunday, we didn't market a day trip to Weymouth on the TransWilts to celebrate the arrival of the new weekday train and arrival for the summer of an early Sunday train with a good connection to the seaside. With good cause because there were engineering works on the Heart of Wessex line, and w ....

4676 - Running shell (operating system) commands from within Ruby
Ruby is an excellent systems admin / scripting tool, allowing other shells and processes to be run from within a Ruby program in various ways. Using backtics or the %x notation, commeand output on STDOUT is routed back into a variable - for example:   first = `grep -c option247 ac_2016051 ....

4675 - Exceptions in Ruby - throwing, catching and using
It's far better to use exceptions to trap run time irregularities than to try to forecast all possible errors, as exceptions form a sort of safety net. From today's Ruby Course, [here] is an example where the user is prompted to enter an integer, and I deliberately use the Integer function rather ....

4674 - Alternating valuses / flip-flop / toggle - example in Ruby
If you want to alternate the value of a variable, here's two ways you can do it in Ruby - answers to a question during this week's Ruby Course   # Too clever?      t = 0   (1..20).each do     puts (((t=(t+1)%2)==0) ? "yes" : "no")  & ....

4673 - Separating detailed data code from the main application - Ruby example
In almost every appication, you'll be writing a number of pieces of code that use the same data type. It's tempting initially to write all the detail of the individual fields and attributes of the data into a main program - especially if the application's not very long and you're in a hurry:   ....

4672 - Annual review of Melksham Matters for Chamber of Commerce AGM
So much has happened in the last 12 months in Melksham that I don't know where to start. I'm missing the AGM on Tuesday 17th (18:00 at Well House Manor / open to all), so sending in my report by email - composed and checked from Saudi Arabia! At the general election almost exactly a year ago, Mic ....

4671 - Ruby training, half a world away
Picking up after tooooo long a break; the last month has been overfilled! I'm writing this on Monday - about Saturday, when I left home at 6 a.m. for a journey out to give a course in Saudi Arabia .... no direct flights London to Dammam, so travelled with Gulf Air and a stopover in Bahrain. A driv ....

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