in reply to using map and swap (aka substitute)

Since you are overwriting the original array with the results, the simplest solution is:

s/_string$// for @list;

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Which mutates the array in-place, thus avoids constructing two lists (in and out of map) as well as 'curing' the perceived problem.

And if you wanted to create a new list from the modified values whilst retaining the original array unmodified, I'd probably do it this way also:

my @list = ...;
my @newList = @list;
s/_string$// for @newList;

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Re^2: using map and swap (aka substitute)
by jwkrahn (Abbot) on Jan 14, 2013 at 22:45 UTC 
    my @newList = @list;
s/_string$// for @newList

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    Or just: 

    s/_string$// for my @newList = @list;

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