arrow-optics / arrow.optics / PLens / pairPFirst
@JvmStatic fun <A, B, R> pairPFirst(): PLens<Pair<A, B>, Pair<R, B>, A, R>
@JvmStatic fun <A, B, R> pairPFirst():
PLens
<
Pair
<A, B>,
<R, B>, A, R>
PLens to focus into the first value of a Pair
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