execute on package install in go

In order to execute code when a package is installed in Go, we can use the init function. The init function is executed automatically when the package is initialized.

Here's an example of using the init function in Go:

main.go
package mypackage

import "fmt"

func MyFunction() {
  fmt.Println("Hello, world!")
}

func init() {
  fmt.Println("mypackage initialized")
}
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12 lines

In this example, we define a package called mypackage which has a function called MyFunction. We also define an init function which will be executed automatically when the package is initialized.

When we import and use the mypackage package in our main program, we will see the message "mypackage initialized" printed to the console.

main.go
package main

import (
  "fmt"
  "path/to/mypackage"
)

func main() {
  mypackage.MyFunction() // "Hello, world!"
}
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So, whenever the mypackage package is installed, the init function will execute automatically and print the message to the console.