`init`

it’s a reserved special name in go, it

can only be a func with no returns or args
cannot be used a variable name ( same as any reserved keyword )

has to be this

func init(){
    // init code
}

interestingly you can define an init func multiple times even in the same file

exec order?

same file is order of appearance
diff files but same package is some compiler generated order not to be relied on
across packages? a dependency chain is followed and deepest dependencies are initialised first. so if main imports a imports b then order of init is b → a → main

total order?

def init_package:
    1. package level vars init
    2. init funcs

1. run init_package on any imported packages
2. run main.main()