Since nobody mentioned it, the problem is that the return value of s/// isn't the modified string. 

my @points = map { s/\s+//; $_ } split(/\t/, $_);

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But then you're modifying map's arguments without intending to do so. Modifying $_ in map is a bad idea. (If you really do mean to modify map's arguments, using for would make your intent more obvious.) 

my @points = map { local $_ = $_; s/\s+//; $_ } split(/\t/, $_);

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Yuck! List::MoreUtils provides a function for just this purpose. It even uses a better method of localizing $_. 

use List::MoreUtils qw( apply );
my @points = apply { s/\s+// } split(/\t/, $_);

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In reply to Re: Splitting on tabs then removing extra white space with map by ikegami
in thread Splitting on tabs then removing extra white space with map by c4onastick

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