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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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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))
Mapping an array / list without a loop - how to do it in Perl 6

In Perl 6, you can use the >> operator to run a named piece of code (a subroutine) on each member of a list / array, returning to you a new list / array of transformed members. For example, the following code reads in all lines from a data file, splits them into individual records, and transforms each record using a sub called getGrowth.

  my @stations = slurp("rstats2015.txt").chomp.split("\n");
  my @opposite = @stations>>.&getGrowth;


Complete code - including the getGrowth sub - [here].

At Well House Consultants, we offer training in Perl 5 and - now that there's an official release out there - we're starting Perl 6 courses very soon. Please take a look at our Perl course page for more details of our plans, and in these early adaptor days, please ask if you don't see exactly what you're looking for - we can help and tailor training whether you're a newcomer to programming, a Perl 5 geek already, or (more likely for most readers) somewhere in between!
(written 2016-01-03)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
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)
  [2295] The dog is not in trouble - (2009-07-17)
  [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)
  [2996] Copying - duplicating data, or just adding a name? Perl and Python compared - (2010-10-12)
  [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)
  [3906] Taking the lead, not the dog, for a walk. - (2012-10-28)
  [3939] Lots of ways of doing the same thing in Perl - list iteration - (2012-12-03)

P600 - Perl 6
  [582] DWIM and AWWO - (2006-01-30)
  [2816] Intelligent Matching in Perl - (2010-06-18)
  [4604] Perl - version 6 - official version launched at Christmas - (2016-01-02)
  [4605] Hello World - in Perl 6 - (2016-01-02)
  [4606] Using Perl 6 to analyse and report on data - (2016-01-02)
  [4607] Classes and object - first steps in Perl 6 - (2016-01-02)
  [4608] Introspecion in Perl 6 - (2016-01-02)
  [4610] Sorting by key or by comparator - Perl 6 - (2016-01-03)
  [4611] Hungarian, Camel, Snake and Kebab - variable naming conventions - (2016-01-03)
  [4620] Perl 6 - a Practical Extraction and Reporting example! - (2016-01-11)


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Mapping an array / list without a loop - how to do it in Perl 6
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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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