I'm wondering what data type to use when working with low level UI Float or Double? - iOS - Double ...

# multiplatform

[Tóth István Zoltán]

I'm wondering what data type to use when working with low level UI Float or Double?

• iOS - Double
• Android - Float or Integer
• JS (browser) - I have no idea but as I remember Double is boxed in Kotlin/JS. On top of that Path2D in browsers uses Double
As of know I use Float in my code and convert it to the appropriate data type when I call platform dependent code. Is this a good idea or should I switch to Double?

[jw]

Long is boxed. Double matches JS's native number type.

[ephemient]

Float is usually good enough - you shouldn't notice the difference in precision in the UI
Double is also fine - it's mostly not slower than Float and the only downside is taking more memory

[ephemient]

for the most part I'd just go with whatever's more convenient for the API you're working with

[ephemient]

also it's not even a real choice on JS, Float is secretly a JS Number, same as Double.

val x = 1f
val y = 1.0000000000000002
println(x == y.toFloat())

is true on Kotlin/JVM, false in Kotlin/JS

[Tóth István Zoltán]

Thanks, I'll switch to double then, it seems better.