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arrow-optics
/
arrow.optics
/
PTraversal
/
foldMap
fold
Map
abstract
fun
<
R
>
foldMap
(
initial
:
R
,
combine
:
(
R
,
R
)
->
R
,
source
:
S
,
map
:
(
focus
:
A
)
->
R
)
:
R
Map each target to a type R and use a Monoid to fold the results