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3417 - What is a namespace and why do we need them?
We name variables. We do it so that we can identify specific pieces of data by a key, rether than have to give some longer sort of identification description when referring to them. We don't refer to "the patriarch of the household" = we refer to Zeb. And we refer to Esther, John and Olivia, Jason ....

3416 - Storing Tcl source code encoded, and running via your own C program
Tcl is a language. And Tcl is also a C library. How's that? Tcl originates from a requirement to provide a taioring capability within C programs that could be accessed in a program-like style. And the program-like style that was implemented actually had the full capabilities of a programming langu ....

3415 - User defined sorting and other uses of callbacks in Tcl and Tk
When I output a table of results, I usually want it to be sorted in some way. In Tcl, I can use lsort to sort a list - there's an example of it running in a default way [here]. However, there's often a need to order records according to a non-default algorithm, and there are switches such as -inte ....

3414 - Passing back multiple results in Tcl - upvar and uplevel
What's the effect of having a meal? There are many. "You're not hungry any more" is the obvious answer, but also "there's washing up to do", "there's a gap on the shelves" and so on. And yet when programming with an assignment statement (or a set command in Tcl - I am running a Tcl course this we ....

3413 - If its Sunday, must it be Weymouth?
I've been to Weymouth five or six times over the last two months - providing an information source to passengers travelling from the TransWilts stations of Swindon, Chippenham and Melksham, and importantly to help them find the right train back in the evening. Frequent rail travellers such as myse ....

3412 - Handling binary data in Perl is easy!
Perl can handle binary data just as easily as ASCII text - but YOU - if you're the programmer - must understand the format of the data that you'll be working with. With binary data it's every bit as important to get the right bytes in the right places as it is to get the appropriate separators betw ....

3411 - Single and double quotes strings in Perl - what is the difference?
In Perl, there's usually more than one way of doing it ... If you're writing a string of text into your program, your first possibility is to use single quotes - in which case you're writing a literal string with everything between the single quote chartacters included exactly in the string. And yo ....

3410 - A review of the Summer Sunday extra trains on the TransWilts line
On Sunday 3rd July, then every Sunday from 17th July to 28th August inclusive, First Great Western ran an additional train at 07:30 from Westbury to Swindon, and at 08:20 from Swindon to Westbury, from where it carried on as the regular 09:12 service to Weymouth. The service was described as a ....

3409 - When variables behave differently - Tie in Perl
Deep in the bowels of any programming language is code to store information into a variable, and get information back from that variable. And in a language that's dynamic in its memory allocation, there will also be code to construct and destroy variables. Does that sound a bit "object oriented". ....

3408 - Journey home by public transport for a Bank Holiday
For past courses I've given in Cambridge, I've chosen to travel by car. The station in Cambridge is one side of town, and most of the people I train are situated on t'other. But this week - seeing as I had to travel up from Melksham on Monday after a day's hard work, and then back on Friday evening ....

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