Why is `String.toInt()` just an alias for `parseIn...

# stdlib

[Dias]

Why is String.toInt() just an alias for parseInt(), but String.toIntOrNull() is custom implementation instead of trycatch implementation of parseInt()? Is it because throwing exceptions in java is heavy or something like that?

[gildor]

Yes, this is because of a Throwable that will be created but ignored

[robin]

To extend a bit on that, every time* a Throwable is created, it captures the current stack trace, which is pretty costly, and throwing and catching across function boundaries also has some overhead.

*actually not every time, see this stackoverflow answer: https://stackoverflow.com/a/36344265/3887813