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Perl ... adding to a list - end, middle, start

You can add an extra element on to a Perl list with push, into the middle with splice and onto the beginning with unshift.

You can extract a single element from splitting a scalar and calling up the element you want using square brackets and the appropriate subscript.

Example:

open (fh,"../../requests.xyz") or die;
  
@x = <fh>;
  
push(@x,"aaron Perl Ruby Opal\n");
unshift(@x,"bob C Lua Matlab Perl Python\n");
splice(@x,3,0,"chris Lua PHP Perl Java\n");
  
foreach $emp (@x) {
  if ($emp =~ /Python/) {
    $name = (split(/\s+/,$emp))[0];
    push @pythoners,$name;
  }
}



Here's the result of running that:

BirthdayBoy:csr1 grahamellis$ perl skillz
Python with bob hazel leane olivia adam barry harry ken nigel rupert
bob C Lua Matlab Perl Python
antonia Perl XML PHP Tcl/Tk MySQL
barbara Tcl/Tk ASP Ruby Java
chris Lua PHP Perl Java
cherry Perl Java Ruby MySQL
delia XML PHP Java ASP
ethel MySQL Perl Tcl/Tk ASP
florence Ruby PHP Java ASP
BirthdayBoy:csr1 grahamellis$


If you want to take something off a list ... pop off the end, shift off the beginning, and splice - again - to take items out of the middle.


(written 2008-07-09, updated 2008-07-08)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
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)
  [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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