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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
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)
  [4610] Sorting by key or by comparator - 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)

P208 - Perl - Lists
  [3939] Lots of ways of doing the same thing in Perl - list iteration - (2012-12-03)
  [3906] Taking the lead, not the dog, for a walk. - (2012-10-28)
  [3870] Writing more maintainable Perl - naming fields from your data records - (2012-09-25)
  [3669] Stepping through a list (or an array) in reverse order - (2012-03-23)
  [3548] Dark mornings, dog update, and Python and Lua courses before Christmas - (2011-12-10)
  [3400] $ is atomic and % and @ are molecular - Perl - (2011-08-20)
  [2996] Copying - duplicating data, or just adding a name? Perl and Python compared - (2010-10-12)
  [2833] Fresh Perl Teaching Examples - part 2 of 3 - (2010-06-27)
  [2813] Iterating over a Perl list and changing all items - (2010-06-15)
  [2484] Finding text and what surrounds it - contextual grep - (2009-10-30)
  [2295] The dog is not in trouble - (2009-07-17)
  [2226] Revision / Summary of lists - Perl - (2009-06-10)
  [2067] Perl - lists do so much more than arrays - (2009-03-05)
  [1918] Perl Socket Programming Examples - (2008-12-02)
  [1917] Out of memory during array extend - Perl - (2008-12-02)
  [1828] Perl - map to process every member of a list (array) - (2008-10-09)
  [1703] Perl ... adding to a list - end, middle, start - (2008-07-09)
  [1316] Filtering and altering Perl lists with grep and map - (2007-08-23)
  [1304] Last elements in a Perl or Python list - (2007-08-16)
  [968] Perl - a list or a hash? - (2006-12-06)
  [928] C++ and Perl - why did they do it THAT way? - (2006-11-16)
  [773] Breaking bread - (2006-06-22)
  [762] Huge data files - what happened earlier? - (2006-06-15)
  [622] Queues and barrel rolls in Perl - (2006-02-24)
  [560] The fencepost problem - (2006-01-10)
  [463] Splitting the difference - (2005-10-13)
  [355] Context in Perl - (2005-06-22)
  [240] Conventional restraints removed - (2005-03-09)
  [230] Course sizes - beware of marketing statistics - (2005-02-27)
  [140] Comparison Chart for Perl programmers - list functions - (2004-12-04)
  [28] Perl for breakfast - (2004-08-25)


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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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