https://play.golang.org/p/GRnbfUG4nut
What’s wrong here?
2 Likes
You can not use := and loops outside of a function body.
3 Likes
package main
import (
"fmt"
"sync"
)
func main() {
fmt.Println("Hello, playground")
var once sync.Once
onceBody := func() {
fmt.Println("Only once")
}
done := make(chan bool)
for i := 0; i < 10; i++ {
go func() {
once.Do(onceBody)
done <- true
}()
}
for i := 0; i < 10; i++ {
<-done
}
}
This is that the main function is not closed correctly, resulting in the content of the function body after the function} word.
It is recommended to use the format function to format the code to get a clear code style.
3 Likes
How would I correct this?
2 Likes
There have already been some spoilers and corrected code in the other responses, also you really should know by today how you can write a function or move code from the outer scope into a function.
2 Likes
Still learning. Such as I am. I have to say, I’m doing my best.
I appreciate your continued valuable help in spite of the fact that I seem to irritate you.
I don’t know what that means.
What exactly is the function body in that code and is it the same as the “scope”?
// } Commented
Why?
And why did you add the brace in the location where you added it?
2 Likes
The main function executes the code that is inside the braces!
3 Likes
Are you referring to onceBody := func()?
Funny, when I removed fmt.Println(“Hello, playground”)
}
and added a closing brace, it worked. 
2 Likes
Thats basically what we have told you to do…
Dunno, I just read the error message and looked briefly at the mentioned line.
Once I see the problem, I drop most of the stuff from that line from my mind, especially if its not my own code.
1 Like
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