How to Correctly Append Multiple Byte Arrays in Go?

Clarifying Append with Multiple Byte Arrays in Go

The provided code attempts to append two byte array slices in Go, but it encounters errors. Let's delve into the issue and explore the correct approach.

The Go Programming Language Specification states that for the append function, "the final argument is assignable to a slice type [], it may be passed unchanged as the value for a ...T parameter if the argument is followed by ...."

Based on this, the code should be modified to use []byte... for the final argument, as seen below:

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

    three := []byte{0, 1}
    four := []byte{2, 3}
    five := append(three, four...)
    fmt.Println(five)
}

With this modification, the code will execute without errors, producing the expected output:

[0 1 2 3]
[0 1 2 3]

This demonstrates the correct syntax and usage of append when dealing with multiple byte arrays in Go.

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