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Re^2: interpolating operators within strings

by abualiga (Scribe)
on Apr 14, 2013 at 03:29 UTC ( #1028592=note: print w/ replies, xml ) Need Help??


in reply to Re: interpolating operators within strings
in thread interpolating operators within strings

Your insight is much appreciated! I was trying to do addition and subtraction of two lists of paired numbers and wanted to avoid separate loops.


Comment on Re^2: interpolating operators within strings
Re^3: interpolating operators within strings
by kcott (Abbot) on Apr 14, 2013 at 04:01 UTC

    Well, in that case, you might be better off with the pairwise function of List::MoreUtils:

    $ perl -Mstrict -Mwarnings -E ' use List::MoreUtils qw{pairwise}; my @x = 0 .. 3; my @y = map { 10 + $_ } @x; say for pairwise { "$a + $b = " . ($a + $b) . "; $b - $a = " . ($b - $a) } @x, @y; ' 0 + 10 = 10; 10 - 0 = 10 1 + 11 = 12; 11 - 1 = 10 2 + 12 = 14; 12 - 2 = 10 3 + 13 = 16; 13 - 3 = 10

    Note how $a holds @x elements and $b holds @y elements. These ($a & $b) are the same special variables used by sort, so don't declare them; they're described in perlvar - SPECIAL VARIABLES - General Variables. You can use them in either order: cf. $a + $b and $b - $a.

    -- Ken

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