How to convert a String to a Long in Kotlin? Safe ways and error handling

Hello colleagues! I just started learning Kotlin (migrated from Java) and encountered a seemingly simple task. I need to read a user ID from a text field in the application (it's a string) and pass it to a function that expects a Long. In Java, I usually used `Long.parseLong(str)` or `Long.valueOf(str)`, wrapping it in a try-catch. But in Kotlin, I see several different methods: `.toLong()`, `.toLongOrNull()`, some extension functions... And I'm confused about which one is correct and safe. Here's an example of my code that currently crashes with an exception: ```kotlin fun main() { val userInput: String = "123abc" // user accidentally entered letters val userId: Long = userInput.toLong() // NumberFormatException! println("User ID: $userId") } ``` I understand that