Channels

If Goroutines are the way to run tasks concurrently, then Channels are the way they talk/exchange data with each other.

Analogy

Imagine Goroutines as relay runners. A Channel is the baton passed from one runner to another.

Rules

Sending data: channel <- data

Receiving data: data <- channel

Receiving data is Blocking. The program will stop and wait until data is sent.

MAIN.GO

package main
import "fmt"
func main() {
    // Create a channel that carries string type data
    messages := make(chan string)
    // Anonymous Goroutine sending data
    go func() {
        messages <- "Hello from Goroutine!"
    }()
    // Main thread waits for data to arrive (Blocking)
    msgContent := <-messages
    fmt.Println(msgContent)
}