How to Convert an Int32 to a String in Go: Which Method is Fastest?

Converting Int32 to String in Go: Beyond Int and Int64

In Go, converting an int32 to a string can be accomplished without the need for intermediate conversions to int or int64. Here are several approaches to achieve this:

1. Using fmt.Sprint(i)

s := fmt.Sprint(i)

This method provides a straightforward one-line solution.

2. Creating a Custom Conversion Function

For optimal performance, a custom conversion function can be created:

func String(n int32) string {
    // Implementation details
    return string(buf[pos:])
}

3. Using strconv.Itoa(int(i))

s := strconv.Itoa(int(i))

While this approach involves converting to int first, it offers a relatively fast solution.

4. Using strconv.FormatInt(int64(i), 10)

s := strconv.FormatInt(int64(i), 10)

This method performs faster than strconv.Itoa, as it directly converts the int32 to string.

Performance Comparison

To compare the efficiency of these methods, a benchmark was conducted with 50 million iterations:

Method	Time Taken
String	5.5923198s
String2	5.5923199s
strconv.FormatInt(int64(i), 10)	5.9133382s
strconv.Itoa(int(i))	5.9763418s
fmt.Sprint(i)	13.5697761s

As evident from the results, the custom conversion function String provides the fastest execution time.

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