side effect import golang

0_side-effect-imports-golang

/*
WARNING: This product can expose you to chemicals including abestos, 
which is known to the State of California to cause cancer and birth 
defects or other reproductive harm.

For more information go to www.P65Warnings.ca.gov.
*/

1_main.go

package main

import (
	"fmt"
	"side-effect/me"		
			        // force gofmt to respect
	_ "side-effect/infect"  // ordering by using line
			        // breaks 
	_ "side-effect/cure"		
)

func main() {
	fmt.Println(me.State) // "cured"
}

2_me.go

package me

import "side-effect/me"

var State = "empty"

3_infect.go

package infect

import "side-effect/me"

// runs first
func init() {
	me.State = "infected"
}

4_cure.go

package cure

import "side-effect/me"

// runs second
func init() {
	  me.State = "cured"
}