When is the init() function run?

Question

I\'ve tried to find a precise explanation of what the init() function does in Go. I read what Effective Go says but I was unsure if I understood fully what it s

Answer 1

https://golang.org/ref/mem#tmp_4

Program initialization runs in a single goroutine, but that goroutine may create other goroutines, which run concurrently.

If a package p imports package q, the completion of q's init functions happens before the start of any of p's.

The start of the function main.main happens after all init functions have finished.