Thanks for the enlightenment.

Still curious though - can this be done using map ?

i.e. can the result of a map be an LVALUE ?

  (map {$self->{$_}} qw|uno dos tres|) = qw|some three values|;
# Gives syntax error:
#   Can't modify map iterator in list assignment
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For perl6, I imagine I may use the zip operator

for zip(qw|uno dos tres|; qw|some three values|) -> $k, $v {
    $self->{$k} = $v;
}
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as an alternative to moritz's simpler solution.