@seen{@list}=();

A bit faster: 

undef @seen{@list};

[download]

Juerd # { site => 'juerd.nl', plp_site => 'plp.juerd.nl', do_not_use => 'spamtrap' }

In reply to Re: Re: Perl Idioms Explained - keys %{{map{$_=>1}@list}} by Juerd
in thread Perl Idioms Explained - keys %{{map{$_=>1}@list}} by broquaint

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