sealed trait OrElse[+A, +B] extends AnyRef
Like Option.orElse
on the type level and like Either
on the value level.
Instead of left and right constructors OrElse
has primary and secondary implicits that lazily
try to resolve first a value of type A
or otherwise a value of type B
.
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- abstract def fold[C](prim: (A) => C, sec: (B) => C): C
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