Why channels are used in Go - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a channel of integers.

Go

ch := make([1])

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

Achan

Bint

Cchannel int

Dchan int

Attempts:

3 left

💡 Hint

Common Mistakes

Using just the data type without 'chan'.

Writing 'channel' instead of 'chan'.

Channels in Go are created using make(chan Type). Here, chan int creates a channel for integers.

2fill in blank

medium

Complete the code to send the value 5 into the channel.

Go

ch := make(chan int)
go func() {
    ch [1] 5
}()

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

A<-

B<-chan

D<-chan int

Attempts:

3 left

💡 Hint

Common Mistakes

Using the arrow in the wrong direction.

Using channel receive syntax instead of send.

To send a value into a channel, use ch <- value. The arrow points from the value to the channel.

3fill in blank

hard

Fix the error in receiving a value from the channel.

Go

ch := make(chan int)
go func() {
    ch <- 10
}()
value := [1] ch

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

A<-

Bch

Cch <-

D<-chan

Attempts:

3 left

💡 Hint

Common Mistakes

Using send syntax instead of receive.

Omitting the arrow operator.

To receive a value from a channel, use <- ch. The arrow points from the channel to the variable.

4fill in blank

hard

Fill both blanks to create a channel and send a value.

Go

var [1] [2]
[1] = make(chan string)
go func() {
    [1] <- "hello"
}()

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

Amessages

Bchan string

Cmsg

Dstring

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-channel type for the variable.

Using an invalid variable name.

First, declare a variable messages of type chan string. Then create the channel with make(chan string).

5fill in blank

hard

Fill all three blanks to receive a value from the channel and print it.

Go

ch := make(chan int)
go func() {
    ch <- 42
}()
value := [1] ch
fmt.[2]("Received: %d\n", [3])

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

A<-

BPrintf

Cvalue

DPrintln

Attempts:

3 left

💡 Hint

Common Mistakes

Using send syntax instead of receive.

Using Println instead of Printf with format specifier.

Passing wrong variable to Printf.

Use value := <- ch to receive from the channel. Then print with fmt.Printf and pass value as argument.