Difference between「なんか」and「なんだか」?


What are some examples of their usage? Is なん the short form of 何【なに】 in both
words?

Also, not sure if this is correct, but the だ in the middle of なんだか should be
the copula. Why is the copula being used like this in the middle of a word?




なんだか is three words なん + だ + か but it's become a set phrase and is used as a
word itself pretty much to express an idea like _somehow, somewhat,_ or
_rather_.

> 今日はなんだかさむい

> It's rather cold today.

なんか is different with a couple of different uses. It's usually an informal
version of なにか or など.

> なんか冷たいものが飲みたい。

> I want something cold to drink.

Or

> 絵や音楽なんかに興味がない

> I have no interest in things like painting and music.

