Receiving data

Learn to receive data from a channel with <-.

Receiving data

To receive from a channel use the same <- operator: v := <-ch. This takes a value from ch and assigns it to v. In an unbuffered channel it blocks until a sender is ready.

The receive expression is v := <-ch. The arrow points out of the channel. You can print directly with fmt.Println(<-ch). A closed channel returns the zero value.

Receive and block

In an unbuffered channel the receiver blocks until a sender is ready. This makes the channel a synchronization tool: both wait until they meet.

With v, ok := <-ch you learn whether the channel is open or closed. If ok is false the channel is closed and drained. This pattern detects channel closure.

Exercise Receive from a channel

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

Show example solution

package main

import "fmt"

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

Test yourself

What does v := <-ch do?
- Closes ch
- Receives from ch into v
- Deletes v
- Sends v on ch
Show answer

Receives from ch into v — receives from ch into v. Sending is ch <- v.
Receive expression
```
v := ____ch
```
Show answer
```
v := <-ch
```
Match receive concepts

<-ch

Receive
v, ok

Status check
block

Wait
closed

Zero value

Next lesson: Buffered channel

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