Go concurrency

This example shows two ways to use goroutines in Go. The first launches a named function as a goroutine with the go keyword. The second demonstrates an anonymous goroutine function that receives a copy of the variable as an argument, avoiding a common race condition where the goroutine would otherwise reference a variable that has been modified in the main goroutine.

// package main

// import (
// 	"fmt"
// 	// "strconv"
// 	// "math"
// 	// "reflect"
// 	// "net/http"
// 	// "log"

// )

// // define interface
// type Writer interface {
// 	Write([]byte) (int, error)
// }

// type ConsoleWriter struct {}

// func (cw ConsoleWriter) Write(data []byte) (int, error) {
// 	n, err := fmt.Printf("Converts bytes to string: %v\n", string(data))
// 	return n, err
// }

// func main()  {
// 	var w Writer = ConsoleWriter{}
// 	w.Write([]byte("101010100001"))
// }

package main

import (
	"fmt"
	"time"
)

func sayHello()  {
	fmt.Printf("Say hello\n")
}

func main()  {
	go sayHello()
	time.Sleep(100 * time.Millisecond)

// bad approach
var msg string = "hello"
go func (i string)  {
	fmt.Printf("%v\n", i)
}(msg)
msg = "Goodbye"
time.Sleep(100 * time.Millisecond)
}