val str = "hey"

when (val line = str) {
    "abc" -> println("abc")
    line.startsWith("h") -> println("starts with h")
}

Any reason this doesn't work? It says

Incompatible type: Boolean and String

on the

.startsWith

part.

It's comparing line with line.startsWith("h"), so "hey" and true/false

Of course 🤦‍♂️

for learning purposes, IS there a way to do what Karel is trying to do here?

I think you have to resort to doing something like this unfortunately:

val str = "hey"

when {
    str == "abc" -> println("abc")
    str.startsWith("h") -> println("starts with h")
}

ok thats what i was thinking. Not the end of the world

What would this print if it were allowed? 🙂

val bool = false
when (val b = bool) {
  b == true -> println(1)
  else -> println(2)
}

Here,

b

is equal to the result of

b == true

, but

b == true

would be false. So the result would be ambigous.

Yeah of course, seems like I wasn't thinking straight.

b == true -> println(1)

would both print and not print at the same time 😄 Schrödinger code

val str = "hey" when (val line = str) { "abc" -> println("abc") lstartsWith("h") -> println("starts with h") } Any

That doesn't work unfortunately, that would try to call a function

startsWith

and compare

line

with the return value.

Or we we had proper pattern-matching 🤔

Yeah

when

needs some upgrades.