groupBy in D?

[Russel Winder via Digitalmars-d-learn]

I am having a hard time Google-ing today. Pytho, Groovy, Kotlin, etc.
have a "groupBy" function that takes a sequence and a key and creates a
dictionary/associative array with keys the result of the key function
on the sequence and key values all the items that match the key.

D doesn't seem to have such a function directly. Unless I missed it…

-- 
Russel.
=============================================================================
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder at ekiga.net
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel at winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder
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