Just come across Kotlin today, and found some interesting ideas
skimming through its tutorial:
1) Null check
Kotlin has Optional types, suffixed with a '?'. Like 'Int?', same
as in Swift. But instead of explicitly unwrapping them (e.g. var!
in Swift, or var.unwrap() in Rust), Kotlin let you do this:
var: Int?
if (var != null)
//You can use var here
Skipping the null check will get you compile time error.
You can even do this:
if (var == null) return;
//You can use var from now on
2) Smart cast
This is a similar to previous one, instead of:
var1: Object;
var2 = cast(String)var1;
You do this:
if (var1 is String)
//You can use var1 as a String here
I think this two ideas are pretty neat, for more information, see:
http://kotlinlang.org/docs/reference/typecasts.html
