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arrow-optics
/
arrow.optics
/
POptional
/
modifyNullable
modify
Nullable
open
fun
modifyNullable
(
source
:
S
,
map
:
(
focus
:
A
)
->
B
)
:
T
?
Modify the focus of a
POptional
with a function
map
Return
null if the
POptional
is not matching