Perl Array Data Structure

A Perl Array Data Structure is a perl data structure that behaves like an array data structure.

• Context:
  • It can (typically) be based on a Perl Array Data Type.
  • It can support a Perl Array Operation, such as a Perl Join Subroutine.
  • It can be an input to an Array-input Perl Subroutine,
  • It can be:
    • a Perl Tuple for a tuple data structure.
    • a Perl Vector for a vector data structure.
    • a Perl Array of Arrays, such as a Perl Matrix.
    • a Perl Array of Hashes.
• Example(s):
  • @Tuple = ("One", "Two", "Three")
• Counter-Example(s):
  • a Perl Associative Array.
  • a Python Array Data Structure, such as a pandas.DataFrame.
• See: Perl Coding Example, Perl Built-In Datatype.

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References

• http://www.tizag.com/perlT/perlarrays.php

2012

• (Melli, 2012-08-31) ⇒ Gabor Melli. (2011). “Perl Array Examples."

Populate manually

   my @Tuple1a  = ("One", "Two", "Three");
   my @Tuple1b  = qw(One Two Three);
   my @Tuple2a  = (@Tuple1a, "Four"); # append
   push(@myNames, "Five", "Six"); 
   my @Tuple2b  = (@Tuple1b, @Tuple2a, "one more"); # append
   my @Vector1  = (3, 1, 4);
   my @Vector2  = (2, 5, 11);
   my @Vector3  = (1, 7, 4);
   my @Matrix1a = ([3, 1, 4], [2, 5, 11], [1, 7, 4], );
   my @Matrix1b = (\@Vector1, \@Vector2, \@Vector3 );

Populate from a file.

   my @Array ;
   while (<>) {
      my @tmp = split (/\t/);  # Split elements into an array.
      push @Array, @tmp ;
   }

Loops

   for $i (@array) {
     print $i ;
   }

Transforming into a string

  $string = join(", ",@Array );

Emptying

  @Array = (); # completely empty @ARRAY
  $#Array = -1 ; # reset the index
  undef @Array ; # forget @Array ever existed

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