Why is it possible to call a function before the declaration?

Question

JavaScript

Can you tell me why there is no error when I call a function before it is declared?
I understand that the function can be in a closure, but this is a potential bug.
For example, if I call test immediately after the declaration

Answer 1

Typescript itself does not check this situation, you need to use a linter

Answer 2

If you call test before the declaration of setCitiesError, then there will be an error, and if after, then setCitiesError will already be in memory

Answer 3

In Javascript, this is called hoisting Read
here - https://developer.mozilla.org/en/docs/%D0%A1%D0%BB...