How to determine whether channel is closed in golang

Map is an unordered collection of key-value pairs. The most important point of Map is to quickly retrieve data through key, which is similar to an index and points to the value of the data.

Map is a collection, so we can iterate over it just like arrays and slices. However, Map is unordered and we cannot determine the order in which it is returned. This is because Map is implemented using a hash table.

Let’s take a look at the method of determining whether a channel is closed in golang:

When reading a channel, determine whether it has been closed

_,ok := <- jobs

If the channel is closed at this time, the ok value is false

Judge whether it has been closed when writing to the channel

1._,ok := <- jobs

If the channel is closed at this time, the ok value is false. If the channel is not closed, one will be missed. jobs

2. Use the select method

to create another channel, called timeout. If it times out, send true to this channel, and the producer will send data to the job's channel. Use select to monitor the timeout, and if it times out, close the jobs channel.

go func() {
 time.Sleep(time.Second * 3)
 timeout <- true
 }()

go func() {
 for i := 0; ; i++ {
 select {
     case <-timeout:
         close(jobs)
         return
 
     default:
         jobs <- i
         fmt.Println("produce:", i)
         }
     }
 }()

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