Golang interface{} to []byte Conversion: A Comprehensive Guide

To convert a Golang interface{} to []byte, you need to use type assertion to cast the interface to a byte array.

Example Code:

func InterfaceToBytes(i interface{}) ([]byte, error) {
    switch v := i.(type) {
    case []byte:
        return v, nil
    case string:
        return []byte(v), nil
    default:
        return nil, fmt.Errorf('unsupported type: %T', i)
    }
}

This function takes an interface{} type parameter i and checks if it's either a []byte or string type. If it is, it converts it to []byte and returns it; otherwise, it returns an error.

Usage Example:

b, err := InterfaceToBytes('hello world')
if err != nil {
    log.Fatal(err)
}
fmt.Printf('%s
', b)

Output:

hello world