Is there a kind of function to get a result before starting the function?

Answer 1

You must declare a function before referencing it, so no.

Answer 2

What do you mean? Please elaborate.
Functions, methods, intantiation works from top to bottom. You can pass the returned value to the next methods

Answer 3

So getting stock prices before they are publushed is impossible. Thanks anyway.

Answer 4

? You can always declare a function before the main loop, or did I just interperate your question wrong?