From what I understood, Applicatives are classes which implement the method apply, but I've seen a version with functions too. This is what it should look like:
fun <T, R> List<T>.ap(fab: List<(T) -> R>): List<R> = fab.flatMap { f -> this.map(f) }
And, when I am testing it with:
fun main(){
val numbers = listOf(75, 454, 7, 45, 45, 56, 75)
val functions = listOf<(Int) -> Int>({ i -> i * 2 }, { i -> i + 3 })
val result = numbers.ap(functions).joinToString()
println(result)
}
The output is:
150, 908, 14, 90, 90, 112, 150, 78, 457, 10, 48, 48, 59, 78
But the expected output is:
153, 911, 17, 93, 93, 115, 153, 81, 460, 13, 51, 51, 62, 81
Basically, I am applying a list of functions to a normal list, that's what it should do. From what I observed, my applicative did his job only for the first function, but for the other, it didn't... How can I get the expected result, using applicatives? I would like to keep my list of functions the way it is already, or at least to keep it similar at most.
