Overview

In GO string are UTF-8 encoded. strings package of GO provides a Join method that can be used to join a string based upon a delimiter.

Below is the signature of the function

func Join(a []string, sep string)

As you can notice this function takes a slice of string and a delimiter and it returns a combined string joined by a delimiter. The delimiter or separator is placed between elements of the input string slice. Please note

• It will return an empty string if the length of the input slice is zero
• It will output a string combined from the slice of strings if the input delimiter or separator is empty.

Let’s look at the working code

Code:

package main

import (
    "fmt"
    "strings"
)

func main() {
    //Case 1 s contains sep. Will output slice of length 3
    res := strings.Join([]string{"ab", "cd", "ef"}, "-")
    fmt.Println(res)

    //Case 2 slice is empty. It will output a empty string
    res = strings.Join([]string{}, "-")
    fmt.Println(res)

    //Case 3 sep is empty. It will output a string combined from the slice of strings
    res = strings.Join([]string{"ab", "cd", "ef"}, "")
    fmt.Println(res)
}

Output:

ab-cd-ef

abcdef