Buffered and unbuffered channels in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an unbuffered channel of integers.

Go

ch := make(chan [1])

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Achan int

Bbuffered

Cstring

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'buffered' as a type is invalid.

Using 'chan int' inside make is incorrect syntax.

The make(chan int) creates an unbuffered channel of integers.

2fill in blank

medium

Complete the code to create a buffered channel with capacity 3.

Go

ch := make(chan int, [1])

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A0

B1

C3

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 creates an unbuffered channel.

Using 1 or 5 does not match the required capacity.

The second argument in make sets the buffer size. Here, 3 means the channel can hold 3 values without blocking.

3fill in blank

hard

Fix the error in sending a value to an unbuffered channel without a receiver.

Go

ch := make(chan int)
// Send value without receiver
ch [1] 10

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A<-chan

B<-

C<-chan<-

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<-' alone without channel causes syntax error.

Using '<-chan' or '<-chan<-' is invalid syntax.

The send operator is chan <- value. Here, ch <- 10 sends 10 to the channel.

4fill in blank

hard

Fill both blanks to create a buffered channel and send a value without blocking.

Go

ch := make(chan int, [1])
ch [2] 5

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A3

B<-

C<-chan

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 capacity makes channel unbuffered, causing blocking.

Using '<-chan' is invalid for sending.

Creating a buffered channel with capacity 3 allows sending without blocking. The send operator is <-.

5fill in blank

hard

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

Go

ch := make(chan int, [1])
ch <- 42
value [2] [3] ch
fmt.Println(value)

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

A1

B:=

C<-

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using capacity 1 may work but does not match the problem.

Using '=' instead of ':=' causes compile error.

Using '<-' after variable name is wrong.

Buffered channel with capacity 3 is created. Receiving uses value := <- ch. This reads a value from the channel.