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richard-gibson/Applicative

Created January 11, 2021 09:25
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Applicative
fun <T> queryUser(s: T?) =
Either.fromNullable(s).mapLeft { "unknown" }
data class Person(val name: String, val age: Int)
val ePerson: Either<String, Person> = Either.applicative<String>().mapN(
queryUser("name"),
queryUser(10)
) { (name, age) -> Person(name, age) }.fix()
val aPerson = Either.applicative<String>().just(Person("foo", 1))
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