Hi,

I'm relatively new in Fantom. I see that Lists and Maps are mutable by default, but why not Str? Why can't I do:

a := "Hola"
a[0] = 'h'

I receive Unkown method sys::Str.set

Thanks,

Use sys::StrBuf as a mutable Str.

@dobesv: thanks. But why Str is immutable. What are the design reasons?

Thanks,

Well for once Str are immutable in Java, no? Also immutability is the foundation of Fantom and its Actor model.