01-main

Hello World

Go version

go version

If you use gvm to install Go, you can change Go versions easily.

1. Check the available versions

   gvm list
   

2. Swtich version

   gvm use go1.18
   

3. Install new version

   gvm install go1.17
   

4. Uninstall a version

   gvm uninstall go1.17
   

Run main.go

package main

import "fmt"

func main() {
    fmt.Println("Hello, World")
}

1. Run with go run

   go run main.go
   Hello, World
   

2. Run with compiled file:

   go build main.go
   

   ./main
   Hello, World
   

Function

func greet(language, name string) (string, error) {
	if language == "Spanish" {
		return fmt.Sprintf("Ola, %s", name), nil
	}
	return fmt.Sprintf("Hello, %s", name), nil
}

func main() {
	fmt.Println("Hello, World")
	greetText := greet("Spanish", "Naka")
	fmt.Println(greetText)
}

Other frequently used commands

1. Format:

   go fmt main.go
   

2. Validate: report likely mistakes in packages

   go vet main.go
   

3. Install

   go install <package>
   

4. Import necessary libraries and remove unnecessary libraries.

   go mod tidy
   

For more details, https://pkg.go.dev/cmd/go

Practices

1. Methods
2. Methods are functions
3. Methods continued
4. Pointer receivers
5. Pointers and functions
6. Methods and pointer indirection
7. Methods and pointer indirection (2)
8. Choosing a value or pointer receiver