Arrow
1.1.5
arrow-optics
/
arrow.optics
/
PLens
/
Companion
/
pairFirst
pair
First
@
JvmStatic
fun
<
A
,
B
>
pairFirst
(
)
:
Lens
<
Pair
<
A
,
B
>
,
A
>
(
source
)
Lens
to focus into the first value of a
Pair