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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Taking the lead, not the dog, for a walk.

When I say that "I'm taking the dogs for a walk", I don't literally carry the dogs for a walk - they walk themselves and I just hold the leads.

Statement of the obvious? Yes!

But you would be surprised how many programmers pass complete full data structures into named blocks of code - "subroutines" - rather than just passing the address / a refernce to the data structure which is rather like the dog's lead. Th etemptation to pass data in this inefficient way is particularly stong in Perl where
  domysub(@info);
passes a complete second copy of the data in the list in @info to the sub, whereas
  domysub(\@info);
would simply pass in a reference - lightweight, like the dog leads - even though the dogs shadowed here weigh 31kgs and 36kgs.

Our Perl Courses go into this subject in a much more through way - not only do we teach you Perl, but we teach you to write good Perl. Next course - 6 weeks time ... places still available!

(written 2012-10-28, updated 2012-11-03)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
Z203 - Cat and Dog
  [62] Technical Open House - (2004-09-25)
  [96] Variable Scope - (2004-10-22)
  [547] Taking the dog for a walk - (2005-12-29)
  [744] We can offer a room, but we can't operate on a dog - (2006-06-05)
  [771] From cat breeder to Cobol to Perl - (2006-06-21)
  [2029] Also for the eyes of the cat - (2009-02-07)
  [2132] Learning about Lurchers - (2009-04-18)
  [2138] Ski bore ... train bore ... dog bore - (2009-04-24)
  [2140] Beware - giving copyright away when you upload a picture - Dogs Trust - (2009-04-25)
  [2167] Watching the tele - (2009-05-10)
  [2252] Leaping dog, Leaping horse, copyright of old masters - (2009-06-20)
  [2271] Dogs Trust, Dog Show, Newbury - (2009-07-06)
  [2295] The dog is not in trouble - (2009-07-17)
  [2450] Family Gathering at 404, The Spa - (2009-10-11)
  [2451] Gypsy says - (2009-10-12)
  [2456] Bright Eyes - (2009-10-16)
  [2496] A better design of mouth - (2009-11-07)
  [2499] ourdog is Greyhound, Staffie and Ginger Cake - (2009-11-09)
  [2555] Bookkeeping - (2009-12-29)
  [2689] Can my dog eat potatoes? Doggie Dietary Research, and political sleaze! - (2010-03-23)
  [2787] Sleeping in on Sunday - (2010-05-30)
  [2897] The Land of the Black Labrador - (2010-08-01)
  [3096] Contrast in pictures - (2010-12-20)
  [3324] Rabbit Shelter - (2011-06-12)
  [3338] Return trip - Dogs Trust, Newbury - (2011-06-27)
  [3530] A typical weekend?? - (2011-11-28)
  [3533] No message - just doggy pictures of the new doggy - (2011-11-30)
  [3537] Letting the foster parents know ... too little or too much? - (2011-12-04)
  [3541] I loves Melksham - (2011-12-06)
  [3553] Changes to morning routines - (2011-12-16)
  [3561] Happy Christmas ... a Christmas morning walk in Melksham - (2011-12-25)
  [3606] Gypsy and Billy enjoy the snow - (2012-02-10)
  [3625] An update on Billy the Greyhound and Gypsy the Lurcher - (2012-02-25)
  [3674] Off to walk the dogs - (2012-03-30)
  [3675] Spring 2012 - (2012-03-30)
  [3737] Postcards from Barmouth - (2012-05-20)
  [3908] Black dogs at Halloween - (2012-10-31)
  [3920] Challenge for a photographer - (2012-11-10)
  [3936] Lisa is home today ... - (2012-11-26)
  [3943] With us for a year already! - (2012-12-03)
  [4016] Red, yellow, green or pink dog? Yellow Dog Project - (2013-02-23)
  [4130] Soft furnishings up a Welsh Mountain - (2013-07-03)
  [4180] Exceptionally, I sign a petition - on a life and death issue for Irish dogs - (2013-09-20)
  [4189] Who are we - Lisa, Graham, Gypsy and Billy - (2013-10-07)
  [4316] Too many Staffies, too many lurchers - (2014-11-16)
  [4333] Misty Melksham Morning - (2014-11-30)
  [4417] Crisp morning, fast run - (2015-02-06)
  [4433] Different views of a Welsh Valley - but headed home - (2015-02-20)
  [4507] In favour of adoption rather than puppy purchase - dogs! - (2015-06-07)
  [4517] Black dog day - and Bobby still seeks his new home - (2015-09-26)
  [4526] Day trip to Lancaster - (2015-10-10)
  [4666] Spring at Well House Manor - (2016-03-27)

P217 - Perl - More than Simple Lists and Hashes!
  [43] Hash of lists in Perl - (2004-09-09)
  [293] Course follow-ups - (2005-04-27)
  [1514] Autovivification - the magic appearance of variables in Perl - (2008-01-21)
  [2241] Perl references - $$var and \$var notations - (2009-06-15)
  [2840] Just pass a pointer - do not duplicate the data - (2010-06-30)
  [2877] Further more advanced Perl examples - (2010-07-19)
  [2996] Copying - duplicating data, or just adding a name? Perl and Python compared - (2010-10-12)
  [3007] Setting up a matrix of data (2D array) for processing in your program - (2010-10-21)
  [3072] Finding elements common to many lists / arrays - (2010-11-26)
  [3105] Adventure with references to lists and lists of references - (2010-12-26)
  [3118] Arrays of arrays - or 2D arrays. How to program tables. - (2011-01-02)
  [3399] From fish, loaves and apples to money, plastic cards and BACS (Perl references explained) - (2011-08-20)
  [3406] Not multidimentional arrays - but lists of lists. Much more flexible. Perl! - (2011-08-26)
  [3444] Take the dog on a lead - do not carry her. Perl references. - (2011-09-17)
  [3577] How to do multidimensional arrays (or rather lists and hashes) in Perl - (2012-01-14)

P208 - Perl - Lists
  [28] Perl for breakfast - (2004-08-25)
  [140] Comparison Chart for Perl programmers - list functions - (2004-12-04)
  [230] Course sizes - beware of marketing statistics - (2005-02-27)
  [240] Conventional restraints removed - (2005-03-09)
  [355] Context in Perl - (2005-06-22)
  [463] Splitting the difference - (2005-10-13)
  [560] The fencepost problem - (2006-01-10)
  [622] Queues and barrel rolls in Perl - (2006-02-24)
  [762] Huge data files - what happened earlier? - (2006-06-15)
  [773] Breaking bread - (2006-06-22)
  [928] C++ and Perl - why did they do it THAT way? - (2006-11-16)
  [968] Perl - a list or a hash? - (2006-12-06)
  [1304] Last elements in a Perl or Python list - (2007-08-16)
  [1316] Filtering and altering Perl lists with grep and map - (2007-08-23)
  [1703] Perl ... adding to a list - end, middle, start - (2008-07-09)
  [1828] Perl - map to process every member of a list (array) - (2008-10-09)
  [1917] Out of memory during array extend - Perl - (2008-12-02)
  [1918] Perl Socket Programming Examples - (2008-12-02)
  [2067] Perl - lists do so much more than arrays - (2009-03-05)
  [2226] Revision / Summary of lists - Perl - (2009-06-10)
  [2484] Finding text and what surrounds it - contextual grep - (2009-10-30)
  [2813] Iterating over a Perl list and changing all items - (2010-06-15)
  [2833] Fresh Perl Teaching Examples - part 2 of 3 - (2010-06-27)
  [3400] $ is atomic and % and @ are molecular - Perl - (2011-08-20)
  [3548] Dark mornings, dog update, and Python and Lua courses before Christmas - (2011-12-10)
  [3669] Stepping through a list (or an array) in reverse order - (2012-03-23)
  [3870] Writing more maintainable Perl - naming fields from your data records - (2012-09-25)
  [3939] Lots of ways of doing the same thing in Perl - list iteration - (2012-12-03)
  [4609] Mapping an array / list without a loop - how to do it in Perl 6 - (2016-01-03)


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Identifying your real customers and keeping them well informed fast
Every Customer Counts
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How should we choose our Wiltshire Police and Crime Commissioner?
Want to help us improve transport in Wiltshire? Here is how!
Python Programming class for delegates who have already self-taught the basics
Shell - Grep - Sed - Awk - Perl - Python - which to use when?
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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