Convert slice, string

A slice contains string data. It contains int data. With strings.Join we can convert a string slice to a string.

For slices with ints, or other types of elements, we can first convert a slice into a string slice. A method like strconv.Itoa can help.

String slice

Here we convert a string slice into a string. Our string slice has three elements. More can be added with append().

package main

import (
    "fmt"
    "strings"
)

func main() {
    values := []string{"one", "two", "three"}

    // Convert string slice to string.
    // ... Has comma in between strings.
    result1 := strings.Join(values, ",")
    fmt.Println(result1)

    // ... Use no separator.
    result2 := strings.Join(values, "")
    fmt.Println(result2)
}
one,two,three
onetwothree

Int slice to string

Here we convert an int slice into a string. First we create a string slice from the data in the int slice. We use a for-range loop for this.

package main

import (
    "fmt"
    "strconv"
    "strings"
)

func main() {

    // The int slice we are converting to a string.
    values := []int{10, 200, 3000}
    valuesText := []string{}

    // Create a string slice using strconv.Itoa.
    // ... Append strings to it.
    for i := range values {
        number := values[i]
        text := strconv.Itoa(number)
        valuesText = append(valuesText, text)
    }

    // Join our string slice.
    result := strings.Join(valuesText, "+")
    fmt.Println(result)
}
10+200+3000

Append runes

In Go we have another option for building up a string. We can append runes to a rune slice based on our data. Then we can convert the rune slice into a string.

With strings.Join we convert a string slice into a string. Sometimes we can convert another type of data, like an int slice, into a string slice before using Join.