How to Convert a Go Byte Array to a Comma-Separated String?

Converting a Byte Array to a String in Go

In Go, the task of converting a byte array to a string is often encountered. This process allows you to represent byte values in a human-readable format.

The Challenge

Consider the following situation:

bytes := [4]byte{1, 2, 3, 4}
str := convert(bytes)

// Expected result: "1,2,3,4"

You may wonder how to create a string (str) that represents the comma-separated values of the byte array (bytes).

The Solution

While it's tempting to try something like:

str = string(bytes[:])

This approach will not yield the desired result. Instead, you can implement a custom conversion function:

func convert(b []byte) string {
    s := make([]string, len(b))
    for i := range b {
        s[i] = strconv.Itoa(int(b[i]))
    }
    return strings.Join(s, ",")
}

This function iterates over the byte array, converting each byte to an integer string using strconv.Itoa. The individual strings are then joined into a single string separated by commas.

Usage

To utilize this function, simply call it like so:

bytes := [4]byte{1, 2, 3, 4}
str := convert(bytes[:])

The str variable will now contain the expected result: "1,2,3,4".

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