Golang Local Module with OOP

calendar2022-02-16 · 2 min read · golang module oop  ·
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Create location of your go code

1~$ mkdir /mnt/c/learning/go

Get the suggested golang init script

It is in separate post in my quicktasks

and don't forget to make it executable. For this quicktask, I assume you named it init.sh as well.

Create and go to project directory

1~$ mkdir local_module_example
2~$ cd local_module_example

Initialize Go environment

1../init.sh

Create module location directory

1~$ mkdir -p example.local/person

Create the module

This is module person

 1~$ cat > example.local/person/person.go << MODULE_BODY
 2package person
 3
 4type person struct {
 5        firstName string
 6        lastName  string
 7        age       int
 8}
 9
10func New(firstName string, lastName string, age int) person {
11        p := person{
12                firstName: firstName,
13                lastName:  lastName,
14                age:       age,
15        }
16
17        return p
18}
19
20func (p person) ShowFirstName() string {
21        return p.firstName
22}
23
24func (p person) ShowLastName() string {
25        return p.lastName
26}
27
28func (p person) ShowAge() int {
29        return p.age
30}
31MODULE_BODY
...
go

Mark it as a module

1~$ cd example.local/person
2~$ go mod init person

In main

 1~$ cd ../../
 2~$ mkdir src
 3~$ cat > src/main.go << MAIN_BODY
 4package main
 5
 6import (
 7        "example.local/person"
 8        "fmt"
 9)
10
11func main() {
12        man := person.New(
13                "George",
14                "Washington",
15                290,
16        )
17
18        fmt.Println("First Name:", man.ShowFirstName())
19        fmt.Println("Last Name: ", man.ShowLastName())
20        fmt.Println("Age: ", man.ShowAge())
21}
22MAIN_BODY
...
go

Point person module to local

~$ cd src ~$ go mod init main ~$ go mod edit -replace example.local/person=../example.local/person ~$ go mod tidy

Run it

1~$ go mod run main
2First Name: George
3Last Name:  Washington
4Age:  290