Unfortunately, there is no item in Effective Java that discusses the reserved type name "var"(since it is introduced in java 10).
There is a saying to use interfaces as types whenever you can (Item 64: Refer to objects by their interfaces). But When using var:
var list = new ArrayList<String>(); // infers ArrayList<String>
(list is of type ArrayList<String>)
Effective Java states It is a bad practice to refer to a variable by its implementation because It makes code dependent on it. This is just one annoyance I've found when starting to use var in my code.
Question:
Are there any best practices when using the reserved type name "var"? When should I use It? When should I avoid it?