Concatenating a string with writer

Besides the built-in + operator, there are more ways to concatenate the string.  This recipe will describe the more performant way of concatenating strings with the bytes package and the built-in copy function.

How to do it...

1. Open the console and create the folder chapter02/recipe04.
2. Navigate to the directory.
3. Create the concat_buffer.go file with the following content:

       package main

       import (
         "bytes"
         "fmt"
       )

       func main() {
         strings := []string{"This ", "is ", "even ",
                             "more ", "performant "}
          buffer := bytes.Buffer{}
          for _, val := range strings {
            buffer.WriteString(val)
          }

           fmt.Println(buffer.String())
         }

4. Run the code by executing go run concat_buffer.go.
5. See the output in the Terminal:

6. Create the concat_copy.go file with the following content:

        package main

        import (
          "fmt"
        )

        func...