|Perl Monk, Perl Meditation|
Re^5: For vs. Foreachby BrowserUk (Pope)
|on Feb 14, 2009 at 04:01 UTC||Need Help??|
I can't believe you are so far out of touch.
If @a contains 10 million elements, the doing ++$a[$_] for 10 .. $#a -10; causes no extra allocation of memory.
But doing ++$_ for @a[ 10 .. $#a -10 ]; nearly triples memory consumption from 198MB to 460MB.
Given the volumes of data people are manipulating with perl, knowing the distinction between a loop that essentially just increments a scalar (a "counting loop") and a loop that constructs a temporary list consisting of several hundreds of megabytes, is valueable information.
As opposed to your wholy artificial distinction between for & foreach, which are for all intents and purposes identically functional synonyms, excepting for some obscure implementation distinction that nobody can think of a use for.
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