GO Channels and Communication

Question 1

How do you create a buffered channel with capacity 5 in Go?

Accepted Answer

make(chan int, 5)

Answer

`make(chan int, 5)` creates a buffered channel of integers with a buffer capacity of 5, allowing up to 5 sends without a corresponding receive.

Question 2

What happens when you send to a full buffered channel with no receiver?

Accepted Answer

The goroutine blocks until space is available

Answer

Sending to a full buffered channel blocks the sending goroutine until another goroutine receives and frees space in the buffer.

Question 3

What is the result of receiving from a closed, empty channel in Go?

Accepted Answer

Returns zero value and false

Answer

Receiving from a closed empty channel immediately returns the zero value of the channel's type and `false` for the ok variable.

Question 4

Which statement correctly closes a channel named `ch`?

Accepted Answer

close(ch)

Answer

The built-in `close(ch)` function closes a channel, signaling to receivers that no more values will be sent.

Question 5

What does `for v := range ch` do with a channel?

Accepted Answer

Receives values until the channel is closed

Answer

`range` on a channel receives values one by one, blocking between receives, and exits the loop when the channel is closed and drained.

GO - Golang Online Test Practice Test