>>>>> "DC" == Damian Conway <[EMAIL PROTECTED]> writes:
DC> Here are a few of the things I'll be using reductions for in Perl 6...
DC> 3. To drill down a hierarchical data structure, following the path
DC> specified by a list of keys:
DC> $leaf_value = [.{}] %hash, @keys;
so that would be expanded how? i read it as:
[EMAIL PROTECTED]@keys[1]} ...
but how is . being used? how does the {} wrap each key instead of being
between each one? also can it be used as an lvalue (that would be useful
too in setting a hash from a list of keys)?
DC> 4. To compute RMS values:
DC> $RMS = sqrt [+] @samples »** 2
are those RMS values under the GPL? :)
DC> 6. As a cleaner form of C<< join.assuming(:sep<>) >>:
DC> $joined = [~] @strings;
i like that. can that be done in a "" string (without $() or whatever
the expression interpolator is now)?
DC> 9. To retrieve the first defined value in a list:
DC> $first_def = [//] @list;
that is a good one for initializing stuff. it should become an idiom
like ||= is now.
for those single ops it reads pretty well. if you choose to use it with
multiple levels of hyper/reduce, it should be well commented.
uri
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Uri Guttman ------ [EMAIL PROTECTED] -------- http://www.stemsystems.com
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