How Do I Correctly Append Multiple Byte Slices in Go Using `append`?

Appending Binary Slices with Variable Arguments

You've encountered an error while trying to append two byte slices (one and two) using append. The issue stems from attempting to pass both slices as []byte without using the correct syntax for passing variable arguments in Go.

As per the Go Programming Language Specification:
"append(s S, x ...T) S // T is the element type of S"

For your case, where the final argument (two) is a []byte slice, you must append the ... operator:
"If the final argument is assignable to a slice type []T, it may be passed unchanged as the value for a ...T parameter if the argument is followed by ...."

Therefore, the correct code is:

import "fmt"
func main() {
    one := make([]byte, 2)
    two := make([]byte, 2)
    fmt.Println(append(one[:], two[:]...))
}

This appends the two slices correctly and prints the combined binary data.

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