Explain the use of Go's close function for closing channels?

Question

Jayant Kumar · Accepted Answer

The use of Go's close function for closing channels are as follows:-
In Go, channels can be closed using the built-in close function. Closing a channel indicates that no more values will be sent on the channel. It is important to note that closing a channel does not delete the values that have already been sent on the channel.
Here's an example of how to close a channel:
ch := make(chan int)
go func() {
    for i := 0; i &#x3C; 5; i++ {
        ch &#x3C;- i
    }
    close(ch)
}()

for i := range ch {
    fmt.Println(i)
}

In this example, a channel ch of type int is created using the make function. A goroutine is launched which sends integers from 0 to 4 on the channel and then closes the channel using the close function. Finally, the values sent on the channel are received using a for range loop until the channel is closed.
It is important to note that attempting to send values on a closed channel will cause a panic. Therefore, it is a good practice to always check whether a channel is closed before attempting to receive from it. This can be done using a multi-valued receive operation with an additional boolean value that indicates whether the channel is closed or not, as shown in the following example:
ch := make(chan int)
go func() {
    for i := 0; i &#x3C; 5; i++ {
        ch &#x3C;- i
    }
    close(ch)
}()

for {
    i, ok := &#x3C;-ch
    if !ok {
        break
    }
    fmt.Println(i)
}

In this example, the for loop continues to receive values from the channel until the channel is closed, at which point the boolean value ok will be set to false, causing the loop to break.

Explain the use of Go's close function for closing channels?

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Explain the use of Go's close function for closing channels?

Jayant Kumar @jayantkumar314

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