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therobyouknow : in-place   2

Print an array one element per line, with line numbering - Perl Circus - Perl Tricks, Tips And Traps.
in a foreach (@array), $_ *refers* to the element being looked at in an iteration. writing to $_ modifies the element in the original array - update in-place. This enables efficiency if passing the array around for stages of processing, rather than working with copies - and also ensures that the original data is updated (if that's what is required)
programming  tutorial  perl  inspiration  array  $_  in-place  inplace  update  within  loop  foreach  reference  efficiency  efficient  howto  computing  work  language  tip  iterate  alias  element  modify  original 
september 2009 by therobyouknow

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