Sending data

Learn to send data to a channel with the <- operator.

Sending data

To send data on a channel use the <- operator: ch <- 42. This sends 42 on the ch channel. In an unbuffered channel it blocks until a receiver is ready.

The send expression is ch <- value. Channel on the left, value on the right, arrow points in. Blocking makes the channel synchronous.

Send and block

In an unbuffered channel the sender blocks until a receiver is ready. This is a rendezvous between goroutines. The sender waits until a receiver appears.

This is useful for synchronization: the goroutine writing ch <- 1 does not proceed until another does <-ch. The two goroutines meet at that point.

Exercise Send to a channel

Inside main, add a ch <- "sent" expression and print sent with fmt.Println.

Show example solution

package main

import "fmt"

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

Test yourself

What does ch <- 42 do?
- Receives 42 from ch
- Deletes 42
- Compares 42
- Sends 42 on ch
Show answer

Sends 42 on ch — sends 42 on ch. An inward arrow means send.
Send expression
```
ch ____ 42
```
Show answer
```
ch <- 42
```
Match send concepts

ch <- v

Send
<-

Operator
block

Wait
receiver

Consumer

Next lesson: Receiving data

We Are Enhancing Your Experience

Cookie Preferences

Strictly Necessary Cookies

Analytical Cookies