package main

import "fmt"

func main() {
    // Create unbuffered channel
	unbufferedChannel := make(chan string)

	go func() {
        // Send a value into a channel using the channel<- syntax
		unbufferedChannel <- "unbuffered channel"
	}()

    // The <-channel syntax receives a value from the channel
	fmt.Println(<-unbufferedChannel)

    // Create buffered channel with size 2
	bufferedChannel := make(chan string, 2)

    // Send a value to a buffered channel. The operation in non blocking
	bufferedChannel <- "buffered"
	bufferedChannel <- "channel"

	fmt.Println(<-bufferedChannel)
	fmt.Println(<-bufferedChannel)
}

// go run main.go 
// unbuffered channel
// buffered
// channel

package main

import (
	"fmt"
	"time"
)

func print(from string) {
	for i := 0; i < 3; i++ {
		fmt.Println(from, ":", i)
	}
}

func main() {
	// Synchronous function call
	print("synchronous call")

	// Asynchronous function call
	// To run this function in a goroutine, use go f(s)
	// This new goroutine will execute concurrently with the calling main goroutine
	go print("asynchronous call")

	// Goroutine can also be execute as an anonymous function
	go func(msg string) {
		fmt.Println(msg)
	}("asynchronous anonymous call")

	// Two previous function calls are now running asynchronously in separate goroutines
	// Wait for them to finish
	time.Sleep(time.Second)
	fmt.Println("done")
}

// $ go run main.go
// synchronous call : 0
// synchronous call : 1
// synchronous call : 2
// asynchronous anonymous call
// asynchronous call : 0
// asynchronous call : 1
// asynchronous call : 2
// done