I like C# initialization because it is safe, and I like C++ initialization because not a single CPU cycle is wasted. Skila borrows the best from those two worlds — all variables have to be initialized. Explicitly by you — after a while implicit initialization becomes a habit, and even if not it is too easy to forget about it. However if for some reasons you cannot or don’t want to initialize variable, “assign”
var a = 5; // OK var b : Int; // error var c : Int = undef; // OK var d = undef; // error
Do you know why the last one is erroneous? Compiler has to know something about a type, so you can have uninitialized (explicitly) variable, but it still has to have a type.