How to Correctly Append Two []byte Slices in Go?

How can I Use Go append with Two []byte Slices or Arrays?

In Go, appending two byte array slices may encounter errors due to type mismatch. Here's a closer look and the correct approach to achieve it.

Problem:

When attempting to append two byte array slices, errors like "cannot use [array] (type []uint8) as type uint8 in append" may arise. This occurs because the append function expects arguments to match the element type of the slice.

Solution:

To resolve this issue, you need to specify the slice types explicitly using []T... syntax for the final argument. In this case, T is []byte.

Here's an example:

package main

import (
    "fmt"
)

func main() {
    one := make([]byte, 2)
    two := make([]byte, 2)
    one[0] = 0x00
    one[1] = 0x01
    two[0] = 0x02
    two[1] = 0x03

    result := append(one[:], two[:]...)
    fmt.Println(result)
}

In this code, the result will be printed as "[0 1 2 3]", effectively combining the two byte array slices. The "..." notation ensures that two[:] is passed as a slice argument.

Additional Notes:

• When appending two slices of the same type, the signature of append is: append(s []T, a ...T)
• The return value of append is a new slice, and the original slice remains unaltered.
• You can also append individual byte values using the append function, e.g.: append(one, 0x02, 0x03)

By following these guidelines, you can correctly append multiple byte array slices in Go.

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