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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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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))
Sorting by key or by comparator - Perl 6

You can sort lists / arrays in Perl 6 - but unlike previous Perl versions, you only need to give a single key expression in your snippet of sort code, rather than instructions on how to compare two values. Of course, since Perl is still eclectic, the old way remains supported too!

Here is an example in which I sorted a list, replacing the previous list. Each item being sorted is itself a list, and I've sorted by the fifth element (element no. 4) of those internal lists.

  @opposite = @opposite.sort({@$^a[4]});

Complete code - [here]. Of course, since Perl never uses 3 characters where 2 will do, my example may be awful hard to follow at first ... please ask me about Perl 6 training courses, currently under development - happy to help with bespoke training requirements from February 2016.

Note - in the move from Python 2 to Python 3, sorting has changed in that language too - also moving from a comparator to a key approach - so it's something we're very familiar with when we come to teach you!
(written 2016-01-03)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
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)
  [4609] Mapping an array / list without a loop - how to do it in 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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Sorting by key or by comparator - 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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