# Select

The `select` statement lets a goroutine wait on multiple communication operations.

A `select` blocks until one of its cases can run, then it executes that case. It chooses one at random if multiple are ready.

### Example

```go
package main

import "fmt"

func fibonacci(c, quit chan int) {
	x, y := 0, 1
	for {
		select {
		case c <- x:
			x, y = y, x+y
		case <-quit:
			fmt.Println("quit")
			return
		}
	}
}

func main() {
	c := make(chan int)
	quit := make(chan int)
	go func() {
		for i := 0; i < 8; i++ {
			fmt.Println(<-c)
		}
		quit <- 0
	}()
	fibonacci(c, quit)
}

```

```bash
0
1
1
2
3
5
8
13
quit
```

## Default Selection

&#x20;The `default` case in a `select` is run if no other case is ready.

### Example

```go
package main

import (
	"fmt"
	"time"
)

func main() {
	tick := time.Tick(100 * time.Millisecond)
	boom := time.After(500 * time.Millisecond)
	for {
		select {
		case <-tick:
			fmt.Println("tick")
		case <-boom:
			fmt.Println("BOOM!")
			return
		default:
			fmt.Println("...")
			time.Sleep(50 * time.Millisecond)
		}
	}
}

```

```bash
...
...
tick
...
...
tick
...
...
tick
...
...
tick
...
...
BOOM!
```