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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
  [4620] Perl 6 - a Practical Extraction and Reporting example! - (2016-01-11)
  [4611] Hungarian, Camel, Snake and Kebab - variable naming conventions - (2016-01-03)
  [4609] Mapping an array / list without a loop - how to do it in Perl 6 - (2016-01-03)
  [4608] Introspecion in Perl 6 - (2016-01-02)
  [4607] Classes and object - first steps in Perl 6 - (2016-01-02)
  [4606] Using Perl 6 to analyse and report on data - (2016-01-02)
  [4605] Hello World - in Perl 6 - (2016-01-02)
  [4604] Perl - version 6 - official version launched at Christmas - (2016-01-02)
  [2816] Intelligent Matching in Perl - (2010-06-18)
  [582] DWIM and AWWO - (2006-01-30)


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