Here's a benchmark, comparing the difference between a double quoted string, and a single quoted string:
#!/usr/bin/perl
use strict;
use warnings;
use Benchmark("cmpthese");
cmpthese(-1, {
"double", q !eval q {$a = "this is a string"}!,
'single', q !eval q {$b = 'this is a string'}!,
});
And the results:
Rate single double
single 34133/s -- -1%
double 34462/s 1% --
Now, before you think double quotes are faster, the results of another run:
Rate double single
double 33810/s -- -0%
single 33811/s 0% --
When I ran this 10 times, double quotes won 5 times, single quotes won 4 times, and there was one tie. The difference was never more than 1%.
So my conclusion, on this single benchmark, is, performance wise, it doesn't matter. If you still want to claim there's a performance difference, come with either a better benchmark, or a discussion of the code of perl that shows there's a difference.
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