Golang : How to capture return values from goroutines?
Got a question asked by a newbie on Facebook yesterday. Her question was how to capture the return values generated by goroutines.
Alright, the simplest way to capture the output generated by goroutines is to use channels. The sample Golang code below demonstrate how to use channels to capture the return values.
package main
import "fmt"
func say(msg chan<- string) {
msg <- "Hello, 世界!"
}
// return multiple values, in this case it is 2
func trueOrFalse(answer chan<- bool) {
answer <- true
answer <- false
}
func main() {
messageChannel := make(chan string)
// execute Gorountine and return the value into messageChannel
go say(messageChannel)
fmt.Println(<-messageChannel)
// the channel has type. To receive 2 boolean values, we use increase it by 2
booleanChannel := make(chan bool, 2)
go trueOrFalse(booleanChannel)
fmt.Println(<-booleanChannel) // true
fmt.Println(<-booleanChannel) // false -- and also pop the stack
}
Output:
Hello, 世界!
true
false
References :
https://socketloop.com/tutorials/golang-channels-and-buffered-channels-examples
https://socketloop.com/tutorials/golang-concurrency-and-goroutine
See also : Golang : Channels and buffered channels examples
By Adam Ng(黃武俊)
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+8.5k Golang : Generate random integer or float number
+3.1k Linux/MacOSX : Search and delete files by extension
+12.4k Golang : Convert(cast) int to float example
+8.9k Golang : Removes punctuation or defined delimiter from the user's input
+22k Golang : Change file read or write permission example
+3.8k Golang : The Tao of importing package
+5.8k Golang : Shuffle strings array
+41.8k Golang : Disable security check for HTTPS(SSL) with bad or expired certificate
+24k Golang : Encrypt and decrypt data with AES crypto
+38.5k Golang : Use wildcard patterns with filepath.Glob() example
+8.9k Golang : Read until certain character to break for loop
+6.6k Useful methods to access blocked websites