My first programming lan was Lua. And they who know that lan knows, that I may was confused when I switched to a 'normal' programming lan like c# or java, because when you init a string you just type: a = ":)". but you can still set it to an int: a = 10. So every vars in Lua aren't sticked to a type. The arrays also can have any kind of var in it.

So I never learned what a String, int, ... is. I didn't understood why a method can't just return anything or why an array has a length.