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Re: merging strings (xor at char level?)

by moritz (Cardinal)
on Jul 03, 2014 at 08:09 UTC ( #1092120=note: print w/replies, xml ) Need Help??

in reply to merging strings (xor at char level?)

Instead of going through the string(s) one character at a time, you could split the second string into whitespace and non-whitespace parts, and then apply them blockwise. That way you have far fewer iterations and operations to do.

use 5.014; use strict; use warnings; my $str1 = "12345 ABC 987 MNO"; my $str2 = " CDE"; my $pos = 0; my $res = ''; for my $chunk (split /([^ ]+)/, $str2) { if (substr($chunk, 0, 1) eq ' ') { $res .= substr $str1, $pos, length $chunk; } else { $res .= $chunk; } } continue { $pos += length $chunk; } if ($pos < length $str1) { $res .= substr $str1, $pos; } say $res;

If you really want it to be fast and correct, provide us some test cases (Test::Simple or Test::More to the rescue!) and some Benchmarks into which we can plug our solutions.

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