Hi there. I have a general question about generics. Suppose I have input data in form of lines, each matching some regex that could be then mapped to a data class or whatever. But on each day it will be different format, different regex and data. YES it’s
#advent-of-code time again 🙂
I created an extension function to help me deal with it:
fun <R> String.parseRecords(regex: Regex, op: (MatchResult) -> R): Sequence<R> =
lineSequence().filterNot(String::isBlank)
.map { regex.matchEntire(it) ?: error("WTF `$it`") }
.map(op)
That works just fine.
How would it look like if I want to make parameters optional (with some default mapping)? I can use
regex: Regex = "(.*)"
but the
op: (MatchResult) -> R = { it.destructured.component1().toInt()}
is a big no-no, because of Type mismatch: inferred type is Int but R was expected.
Is it even possible to add default parameter values for generic functions?
