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digitalmars.D.learn - groupBy in D?

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=E2=80=
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Russel.
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Mar 14