Why do I get a syntax error with my switch statement?

php editor Xinyi often encounters various problems and confusions when writing code. One of the common problems is syntax errors when using switch statements. This may prevent the code from running properly and cause problems for development. So, why does this error occur? In this article, we will answer this question and provide some solutions to help you better understand and use switch statements and avoid syntax errors. Let’s take a look!

Question content

I need to get a string variable from a channel in a switch statement.

go version go1.19.6 linux/amd64 .\test.go:12:12: Syntax error: unexpected: =, expected:

package main

import (
    "fmt"
)

func main() {
    writeMsgs := make(chan string)
    go sendMsgs(writeMsgs)
    for {
        switch{
        case msg := <-writeMsgs:
            fmt.Println(msg)
        }
    }
}

func sendMsgs(writeMsgs chan string) {
    for i:=0;i<5;i++ {
        writeMsgs<-"Test"
    }
    close(writeMsgs)
}

I cross-referenced multiple tutorials but can't figure out where I'm going wrong.

Workaround

go does not allow channel communication because of the switch case condition, you must use the select instead construct very similar.

The golang select statement is similar to the switch statement and is used for multi-channel operations. This statement will block until any of the provided cases are ready.

in your case is

func main() {
    writeMsgs := make(chan string)
    go sendMsgs(writeMsgs)
    for {
        select {
        case msg := <-writeMsgs:
            fmt.Println(msg)
        }
    }
}

Here You can try it.

The above is the detailed content of Why do I get a syntax error with my switch statement?. For more information, please follow other related articles on the PHP Chinese website!