Something to note here, for your particular case you’re correct that concatenating strings is the most efficient, but for anything where you need to append to a buffer in a loop, or if you need to concatenate many more times, bytes.Buffer is going to blow string concatenation out of the water. I ran a few tests of my own on 10k and 100k iterations and got:

63.6231ms (avg) for string concatenation
359.51µs (avg) for appending using bytes.Buffer

On 100k iterations:

5.583221202s
3.468977ms

So don’t stop talking to bytes.Buffer altogether, just make sure you talk to it in the right situations.