How do I avoid sending on a closed channel in Go?

In Go, sending on a closed channel will result in a runtime panic. To avoid this, you need to ensure that the channel is open before sending a value to it. There are various strategies to deal with this issue, such as using a boolean flag, utilizing the 'select' statement, or implementing a function that verifies the channel state. Below is an example illustrating how to avoid sending on a closed channel.


    package main

    import (
        "fmt"
        "sync"
    )

    func main() {
        ch := make(chan int)
        var wg sync.WaitGroup
        wg.Add(1)

        go func() {
            defer wg.Done()
            for i := 0; i < 5; i++ {
                ch <- i // sending data to the channel
            }
            close(ch) // closing the channel after sending
        }()

        go func() {
            for {
                val, ok := <-ch // check if the channel is still open
                if !ok {
                    break // exit the loop if the channel is closed
                }
                fmt.Println(val) // process the received value
            }
        }()

        wg.Wait() // wait for all goroutines to finish
    }

How do I avoid sending on a closed channel in Go?

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How do I avoid sending on a closed channel in Go?

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