referencing a map produced from a function

A variable called a that contains a map can be referenced as $a and you can
simulate a map:get with with the function call $a($keyValue).

Suppose the map was instead created by a function that takes a parameter
that determines what kind of map to create.

 So local:createMap($typeOfMap) returns a map. Do we know have use the
explicit map:get form, if not what does the function call form look like.

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