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Re^2: testing more than one item for equality

by blazar (Canon)
on Oct 18, 2006 at 13:09 UTC ( [id://579063]=note: print w/replies, xml ) Need Help??


in reply to Re: testing more than one item for equality
in thread testing more than one item for equality

if ( scalar (grep { $_ eq $item3 } @list) == scalar @list) { print "All are equal.\n"; }

But that's simply not what he asked for, and even if it were those scalars are redundant, thus making your code bloated without adding to readability, since == imposes scalar context anyway. Thus

if (grep { $_ eq $item3 } @list == @list) { print "All are equal.\n"; }

Furthermore, you store into the @list array for the sole purpose of that comparison, but that's not necessary either: indeed checking for all the elements of a list to do something is the same thing as checking none of them not to do that particular thing, hence

if (grep $_ neq $item3, $item1, $item2) { print "All are equal.\n"; }

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Re^3: testing more than one item for equality
by Velaki (Chaplain) on Oct 18, 2006 at 13:17 UTC

    You're right. I forgot my DeMorgan's Law.

    Mea culpa,
    -v.
    "Perl. There is no substitute."

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