From: "Guy N. Hurst" <gnhurst@...>
Date: 2001-04-07T15:56:09+09:00
Subject: [ruby-talk:13548] #U017 "partition" method -- followup

In  [ruby-talk:12816] "Re: Haskell goodies, RCR and challenge",
I proposed a bunch of alternate names for this, with no reply.
Since the list is fairly quiet anyway, I figured I'd add some
comments...

First of all, the proposed feature is:

(0..4).to_a.partition {|e| e%2 == 0}  # => [[0,2,4], [1,3]]

No one mentioned using <=> or other arbitrary methods to use
instead of "==" which could result in multiple sub-arrays.

I think Array#split would be a more general name for this.
(String#split makes an array of substrings based on a pattern match.)

Array#split would make an array of subarrays based on a block:

[1,2,3,4,5].split{|x| x<=>3}    # => [[3],[4,5],[1,2]]

ary=["an","a","the","when","if","can","do"]
ary.split{|x| x.length }  # => [[],["a"],["an","if","do"],["the","can"],["when"]]

Array#multiplex is another possible name.


It could also be made to generate a hash, to allow for block output
other than just numbers:

ary.split{|x| x[0..0]}  # => {"a"=>["an","a"], "t"=>["the"], etc... }


Maybe Array#assort  or  Array#allot  could be used ?


Guy N. Hurst

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