On Tue, May 31, 2011 at 5:06 PM, Uri Guttman <[email protected]> wrote:
> the OP actually looked up the docs and found
> lvalue substr but i replied it shouldn't be used as 4 arg substr can do
> the same thing and is much faster.
I agree. Although lvalue substr is clearer than 4-arg substr, it's
even slower than assignment. Assignment is far clearer than the
lvalue substr in a case like this, so I don't see a good reason to use
lvalue substr. That said, unless I needed to optimize, in most cases
I'd just stick with assignment as the clearest solution despite being
slower than 4-arg substr.
use Benchmark qw( cmpthese );
cmpthese(-2, {
assign => sub { my $x = 'bar'; $x = "foo/$x" },
substr => sub { my $x = 'bar'; substr $x, 0, 0, 'foo/' },
lvalue => sub { my $x = 'bar'; substr($x, 0, 0) = 'foo/' },
});
Rate lvalue assign substr
lvalue 1257127/s -- -37% -60%
assign 2001479/s 59% -- -36%
substr 3127850/s 149% 56% --
--
Nick Patch
nickpatch.net
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