The answer is always going to be: It depends. Upon many things including what you subsequently do with the variables.
One trivial test each of ''. and 0+ shows that in these particular cases, the former costs little, and the latter saves a lot:
a => q[ my $s = join '', map ''.$_, 1 .. 1e5 ],
b => q[ my $s = join '', map $_, 1 .. 1e5 ],
Rate a b
a 12.3/s -- -18%
b 14.9/s 21% --
a => q[ my $s = sum map 0+$_, '0001' .. '1000'],
b => q[ my $s = sum map $_, '0001' .. '1000'],
Rate b a
b 1452/s -- -76%
a 6056/s 317% --
I guess whether you think either or both are important will depend upon whether your programs spend most of their time sitting around waiting for someone to click something, or doing real work :)
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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