Re: finding index number in an array

anything you do (besides List::Util first) will be "just as bad" as a foreach, because you'll have to loop through - even a grep is just a loop

The bonus of "first" is that it is executed in a subroutine and can return immediately when it finds the first instance.

Comment on Re: finding index number in an array

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Re^2: finding index number in an array by fishbot_v2 (Chaplain) on May 27, 2005 at 22:54 UTC
The additional bonus of List::Util::first() is that it is compiled, so you will get performance akin to grep. I wrote a myfirst using `for` that shortcircuits like List::Util: `Rate myfirst first myfirst 875/s -- -83% first 5236/s 498% --` [download] More interesting, possibly, is a comparison of `grep` and `first` solutions - does the slight overhead of calling `first` (a compiled, but still user, function) out-weight the benefit? Read more... (706 Bytes)	[reply] [d/l] [select]

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Re^2: finding index number in an array
by fishbot_v2 (Chaplain) on May 27, 2005 at 22:54 UTC

The additional bonus of List::Util::first() is that it is compiled, so you will get performance akin to grep.

I wrote a myfirst using for that shortcircuits like List::Util:

          Rate   myfirst   first
myfirst  875/s       --     -83%
first   5236/s      498%     --
[download]

More interesting, possibly, is a comparison of grep and first solutions - does the slight overhead of calling first (a compiled, but still user, function) out-weight the benefit?