How to join a slice of strings into a single string?

package main

import (
"fmt"
"strings"
)

func main() {
reg := [...]string {"a","b","c"}
fmt.Println(strings.Join(reg,","))
}

gives me an error of:


prog.go:10: cannot use reg (type [3]string) as type []string in argument to strings.Join

Is there a more direct/better way than looping and adding to a var?

The title of your question is:

How to join a slice of strings into a single string?

but in fact, reg is not a slice, but a length-three array. [...]string is just syntactic sugar for (in this case) [3]string.

To get an actual slice, you should write:

reg := []string{"a", "b", "c"}

and then you'll find that your code for joining it works perfectly:

fmt.Println(strings.Join(reg, ","))

(Try it out: https://play.golang.org/p/vqU5VtDilJ.)

Incidentally, if you ever really do need to join an array of strings into a single string, you can get a slice from the array by adding [:], like so:

fmt.Println(strings.Join(reg[:], ","))

(Try it out: https://play.golang.org/p/zy8KyC8OTuJ.)

Stack Overflow Q#28799110, score: 288