What is a channel?

Learn that a channel is a communication tool between goroutines.

What is a channel?

A channel is a typed conduit for communication and synchronization between goroutines. One goroutine sends data on a channel, another receives it; Go handles the transfer safely and synchronously.

Channels are the core of Go's philosophy: do not communicate by sharing memory; share memory by communicating. You create one with make(chan int).

Channel philosophy

Go's famous slogan is: do not communicate by sharing memory; instead, share memory by communicating. The channel is the tool for this philosophy.

If multiple goroutines access a shared variable a race occurs. With a channel data passes through one goroutine at a time and synchronization is automatic. This enables lock-free designs.

Exercise Message via channel

Inside main, add a make(chan string) call and print channel ready with fmt.Println.

Show example solution

package main

import "fmt"

func main() {
    ch := make(chan string)
    go func() { ch <- "channel hazır" }()
    fmt.Println(<-ch)
}

Test yourself

What is a channel for?
- Communication between goroutines
- To declare variables
- To write loops
- To catch errors
Show answer

Communication between goroutines — communication between goroutines.

Creating a channel

ch := ____
ch <- 42

Show answer

ch := make(chan int)
ch <- 42

Match channel concepts

channel

Communication pipe
make

Creation function
<-

Send/receive operator
chan

Type keyword

Next lesson: Channel with make

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