String.kt for example will use String.java on the ...

# getting-started

[Florian]

String.kt for example will use String.java on the JVM?

[diesieben07]

That depends on the type and the platform. For Strings you will get String.java on the JVM and a plain string in JS for example.
But if the target platform does not have a native version of the type, it will be emulated (Long for example is emulated by a class containing two 32 bit numbers on JS, because JS only has a 64-bit floating point).

[Florian]

thanks

[Florian]

thats why these classes look so "imcomplete" (i.e. no method bodies, no actual value holder etc)

[diesieben07]

There is a section in the documentation about this:
For JVM: https://kotlinlang.org/docs/reference/java-interop.html#mapped-types
For JS: https://kotlinlang.org/docs/reference/js-to-kotlin-interop.html#representing-kotlin-types-in-javascript

[diesieben07]

Yes, a big part of those classes is "compiler magic"

[Florian]

ah thanks I remember that

[diesieben07]

(I am sure there is something for native, too, but I am not experienced with that)

[diesieben07]

The only thing that (currently) is a bit strange is Float on JS, because it behaves identical to Double. But this will change in a future version.

[diesieben07]

Here is the closest I could find for native: https://kotlinlang.org/docs/reference/native/c_interop.html

[Florian]

thanks for the link