A little experience of Select Case in Golang

This is a created article in which the information may have evolved or changed.

Look at the code first:

package mainimport (    "fmt"    "runtime")func main() {    runtime.GOMAXPROCS(1)    int_chan := make(chan int, 1)    string_chan := make(chan string, 1)    int_chan <- 1    string_chan <- "hello"    select {    case value := <-int_chan:        fmt.Println(value)    case value := <-string_chan:        panic(value)    }    fmt.Println(123)}

Run two times and the results are:

E:\go_study>go run 4.go1123E:\go_study>go run 4.go1123E:\go_study>go run 4.go1123E:\go_study>go run 4.go1123E:\go_study>go run 4.gopanic: hellogoroutine 1 [running]:main.main()        E:/go_study/4.go:18 +0x2f4exit status 2E:\go_study>

Found no, if two cases are satisfied with the condition, it is pseudo-random select one to execute, rather than the previous thought of the top-to-bottom to determine which case can be executed.

Also, when a case is executed, it exits select because it prints 123.

Finally, if no case can be executed, execute default immediately, then exit Select.

Reference