Select with multiple channels in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to receive a value from channel c1.

Go

select {
case msg := <-[1]:
    fmt.Println("Received", msg)
}

Drag options to blanks, or click blank then click option'

Anil

Bc1

Cdone

Dc2

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong channel name in the receive expression.

Trying to receive from a closed or nil channel.

The select statement waits for communication on channel c1. Receiving from c1 assigns the value to msg.

2fill in blank

medium

Complete the code to send the string "hello" to channel c2 inside the select.

Go

select {
case [1] <- "hello":
    fmt.Println("Sent hello")
}

Drag options to blanks, or click blank then click option'

Ac2

Bc1

Cmsg

Ddone

Attempts:

3 left

💡 Hint

Common Mistakes

Putting the value before the arrow instead of the channel.

Using a variable name instead of the channel.

The send operation uses the channel name on the left side of the arrow. Here, c2 is the channel to send the string "hello".

3fill in blank

hard

Fix the error in the select statement to correctly receive from channel done.

Go

select {
case <-[1]:
    fmt.Println("Done signal received")
}

Drag options to blanks, or click blank then click option'

Adone

Bc2

Cc1

Dmsg

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name instead of the channel.

Trying to assign the received value when none is sent.

The channel done is used to receive a signal without assigning it to a variable. The syntax <-done waits for a value from done.

4fill in blank

hard

Fill both blanks to receive from c1 and send "ok" to c2 inside the select.

Go

select {
case msg := <-[1]:
    fmt.Println("Received", msg)
case [2] <- "ok":
    fmt.Println("Sent ok")
}

Drag options to blanks, or click blank then click option'

Ac1

Bc2

Cdone

Dmsg

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up send and receive channels.

Using variable names instead of channel names.

The first case receives from c1 and assigns to msg. The second case sends the string "ok" to c2.

5fill in blank

hard

Fill all three blanks to receive from c1, send "done" to c2, and receive from done channel.

Go

select {
case msg := <-[1]:
    fmt.Println("Received", msg)
case [2] <- "done":
    fmt.Println("Sent done")
case <-[3]:
    fmt.Println("Done signal received")
}

Drag options to blanks, or click blank then click option'

Ac1

Bc2

Cdone

Dmsg

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing send and receive operations.

Using variable names instead of channel names.

The first case receives from c1. The second sends "done" to c2. The third waits for a signal from done.