Beginner Question About Structure Initialization

[Jon_Forrest]

I’m learning Go (using 1.9.2 on Centos 7). Consider the following
trivial program, which works fine:

package main
import "fmt"
type symbol struct {
    name string
    fn func(int)
    options int
}
func main() {
symbols := [] symbol {
    {"jon",x, 4},
    }
    symbols[0].fn(13)
    fmt.Println("symbols:  ", symbols)
}
func x(arg int) {
    fmt.Println("x: arg = ", arg)
}

This does what I expect, which is to show how to
initialize a structure to contain various values.

I then tried to modify this program so that the structure
initialization is done outside any function, like so:

package main
import "fmt"
type symbol struct {
    name string
    fn func(int)
    options int
}
var symbols = [] symbol  {
    {"jon",x, 4,}
}
func main() {
    symbols[0].fn(13)
    fmt.Println("symbols:  ", symbols)
}
func x(arg int) {
    fmt.Println("x: arg = ", arg)
}

However, this doesn’t compile, saying
./bad.go:12:18: syntax error: unexpected newline, expecting comma or }

I don’t understand how to fix this. I have to admit that I don’t
know why one style would be preferred over the other, but I’d like to
understand how to correct the second case.

Cordially,
Jon Forrest

[NobbZ (Norbert Melzer)]

Read the error message, it tells you to have a comma at the end of line 12 is required, or you need to move the closing curly one line up.

[saberuster]

in your first example the code is {"jon",x, 4},,but in your second example the code is {"jon",x, 4,}. you lose the comma。