The various synopses contain many mentions of Iterators.  These are used,
for instance, to implement lazy lists so the expression 1..1_000_000 does
not have to allocate a million element array.  But as far as I can tell the
term is never defined anywhere in the synopses. Is Iterator a role, and if
so what methods is it required to have?  Do functions like map and grep,
which in Perl5 return lists, return Iterators in Perl6?  Can an Iterator be
passed to a function (like map and grep again) that requires a list as an
input?  Does an array or hash have only one Iterator or can it have several
independent ones?


Joe Gottman  

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