Question

I have this sample code where I’m defining an array but it doesn’t compile:

$ cat a.go
package f
func t() []int  {
    arr := [] int {
        1,
        2
    }
    return arr
}

oreyes@OREYES-WIN7 ~/code/go
$ go build a.go
# command-line-arguments
.\a.go:5: syntax error: unexpected semicolon or newline, expecting }
.\a.go:7: non-declaration statement outside function body
.\a.go:8: syntax error: unexpected }

However if I remove the newline it works:

$ cat a.go
package f
func t() []int  {
    arr := [] int {
        1,
        2 }
    return arr
}

oreyes@OREYES-WIN7 ~/code/go
$ go build a.go

Howcome?

Answer 1

Simply put a comma (,) at the end of all lines containing elements of the array:

arr :=  [] func(int) int {
    func( x int ) int { return x + 1 },
    func( y int ) int { return y * 2 }, // A comma (to prevent automatic semicolon insertion)
}