Golang : How to flush a channel before the end of program?

Problem :

Your program that uses channels and go routines did not print out all the expected result. Upon investigation, it seems that the data in channels were not flushed out before the program termination. What can be done to flush data from channel before program termination?

Solution :

There is no build in method to "flush" data out from channel. You can either use WaitGroup to pause the program termination until all channels data are printed out or program your function to indicate if they are done (i.e goroutine completed ) before moving on to next process or terminate the program.

See examples at :

https://www.socketloop.com/tutorials/golang-wait-and-sync-waitgroup-example

https://www.socketloop.com/tutorials/golang-close-channel-after-ticker-stopped-example