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

Converting a Byte Array to a String in Go

In Go, working with byte arrays and strings is crucial for various tasks. However, converting a byte array to a string requires careful consideration of different approaches.

Consider the following scenario: you have a byte array and want to transform it into a string, ensuring that each byte is represented as a numerical character separated by commas.

The bytes[] to string() Method

Initially, one might attempt to use the string() function to convert the byte array to a string, hoping that it will automatically perform the conversion as desired. However, this approach doesn't produce the expected result. The string() function simply interprets the byte array as a sequence of bytes and generates a binary string rather than a string of comma-separated integers.

A Custom Conversion Function

To address this specific conversion requirement, a custom function can be tailored for the task. The function loops through the byte array, converts each byte to a string using the strconv.Itoa() function, and stores the converted string in a slice. Finally, it joins the elements of the slice using a comma as the separator, resulting in the desired string output.

Here's the implementation of the custom 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, ",")
}

Usage

To use this function, you can call it with the byte array as input and store the returned value in a string variable.

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

In this example, the byte array [1, 2, 3, 4] would be converted to the string "1,2,3,4" and assigned to the variable str. This custom function provides a simple and effective way to convert a byte array to a string with the specified format.

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