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Re: Cost of list assignment -

by BrowserUk (Pope)
on Jan 31, 2013 at 09:38 UTC ( #1016269=note: print w/replies, xml ) Need Help??

in reply to Cost of list assignment -

but wondering if this costs more than than doing it otherways

Yes, measurably so:

@a=1..1e6; cmpthese -3,{ a => q[ @a[ $_-1, $_ ] = @a[ $_, $_-1 ] for 1 .. $#a; ], b => q[ my$t; $t = $a[ $_-1 ], $a[ $_-1 ] = $a[ $_ ], $a[ $_ ] = $ +t for 1 .. $#a; ] };; Rate a b a 1.58/s -- -5% b 1.66/s 5% --

but the difference is tiny, so only becomes significant in inner loops with high iteration factors.

Other times the clarity is worth the cost.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

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