How to Efficiently Convert a []int8 to a String in Go?

Converting []int8 to String

The conversion from []int8 to a string requires a manual process since they are different data types. To determine the optimal conversion approach, we must consider two options: []byte and []rune.

Option 1: []byte

Strings are stored internally as UTF-8 encoded byte sequences, represented by []byte. Converting []int8 to []byte is straightforward, as a byte is an alias for uint8, and the language supports []byte to string conversion.

Option 2: []rune

A rune is a Unicode codepoint. Mapping int8 values to runes one-to-one would result in incorrect output if the input contains characters encoded using multiple bytes (UTF-8). Therefore, we must opt for a 1-1 int8 to byte mapping.

Optimal Conversion Method

Based on the requirements, the most efficient conversion method is:

func B2S(bs []int8) string {
    b := make([]byte, len(bs))
    for i, v := range bs {
        b[i] = byte(v)
    }
    return string(b)
}

This method uses indexing [] for element assignment instead of the append function, providing improved performance due to the known slice length.

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