I have the following routine:

sub remap {
    my %remap = qw{
THIS THAT
BLACK WHITE
TALL SHORT
};
    $remap{ $_[0] };
}

[download]

Put in TALL, get out SHORT... The use of a lexical sort of strikes me as being a little unnecessary, what I would like to do would be to just build an anonymous hash out of the qw list, and dereference it:

sub remap_anon {
    @{[qw{
THIS THAT
BLACK WHITE
TALL SHORT
}]}->{$_[0]};
}

[download]

Cool! That actually compiles. I was tickled pink. Trouble is, I don't know what it does. It certainly doesn't do what I want it to. If I try to run it I get: Can't coerce array into hash at remapper line 15

So I googled around a bit, and the only solutions I see are what I had in the first place: dump the list into a hash and then dereference it. Drat. I tried enclosing the anonymous @{[...]} in an outer %{...] or even %{[...]}, but perl continues to choke with the same message. At this stage it's just shotgun debugging, and besides, the syntax is a net loss.

So my question is, even if perl can't do it by itself (because "You used an array where a hash was expected, but the array has no information on how to map from keys to array indices. You can do that only with arrays that have a hash reference at index 0"), is there a way to coerce perl to coerce an array into a list? And what does that message really mean?


print@_{sort keys %_},$/if%_=split//,'= & *a?b:e\f/h^h!j+n,o@o;r$s-t%t#u'

In reply to Coercing an array into a hash by grinder

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