:warning: *The Kotlin Multiplatform division-by-ze...

# library-development

[Loïc Lamarque]

⚠️ The Kotlin Multiplatform division-by-zero trap: 12 / 0 behaves differently on every platform

On Kotlin/JS, 12 / 0 silently returns 0. On JVM and Native it throws ArithmeticException. That guard you wrote and tested on JVM? It is silently bypassed when the same code runs on JS.

We wrote a short post about what causes this and how the Integer type in Kotools Types 5.1.1 fixes it consistently across all three targets — including null-safe divOrNull and remOrNull variants for those who prefer not to catch exceptions.

Read it here 👇

[Dan Rusu]

I recommend filing a bug with Jetbrains. This library uses a String to represent integers in some platforms. That's a red flag and complete non-starter.

Swapping this in would probably make any integer calculations over 100 times slower and also introduces a ton of garbage collection overhead.

[Artem Kobzar]

Thank you for sharing the pain point 🙏
We've planned the fix of this behavior and want to ship it in the following release (2.4.20).
You can watch to the updates here: https://youtrack.jetbrains.com/issue/KT-17719

[Loïc Lamarque]

@Dan Rusu Starting from Kotools Types 5.2 (coming this month), Integer will use numeric platform-specific types instead of String. This would definitely improve performance of integers' arithmetics. See its changelog.