i'm seeing some weird behavior with the js compile...

# javascript

[Nolan]

i'm seeing some weird behavior with the js compiler. i'm wondering if i'm doing something wrong, or if it's an issue with the compiler. the behavior is the same with both IR and legacy compilers. code snippets in thread.

[Nolan]

Kotlin:

var foo = foos[parentKey]?.find { it.typeCode == typeCode }!!
compoundKey.split("/").forEach { key ->
    val selectedBar = bars.find { it.barKey == key }!!
    val newBars = foo.bars.toMutableList()
    newBars.removeAll { it.barKey == key }
    newBars += selectedBar
    foo = foo.copy(bars = newBars)
}

(sorry, this was hard to obfuscate)

[Nolan]

Compiled js

var tmp$;
            var $receiver = tmp$;
            var find$result;
            var firstOrNull$result;
            firstOrNull$break: do {
                var tmp$_0;
                tmp$_0 = $receiver.iterator();
                while (tmp$_0.hasNext()) {
                    var element = tmp$_0.next();
                    if (element.typeCode === typeCode) {
                        firstOrNull$result = element;
                        break firstOrNull$break;
                    }
                }
                firstOrNull$result = null;
            } while (false);
            find$result = firstOrNull$result;
            var foo = {
                v: ensureNotNull((tmp$ = closure$foos.get_11rb$(parentKey)) != null ? find$result : null)
            };

[Nolan]

$receiver is undefined when $receiver.iterator() is called. however, if i change foo to a val instead of var, i don't have this problem. obviously i have to comment out the reassignment for that to compile, but that is the only material change -- it still fails with var when there is no reassignment

[Robert Jaros]

You should probably create a reproducible sample project and open an YouTrack issue.

[Nolan]

i'll see what i can do