Create an encoder for a list. This does not encode the length of the list.

import Bytes exposing (Endianness(..))
import Bytes.Encode
import Bytes.Decode
import Bytes.Decode.Extra


data : List Int
data =
    [ 6, 3, 200, 236, 123 ]


list (Bytes.Encode.unsignedInt32 BE) data
    |> Bytes.Encode.encode
    |> Bytes.Decode.decode (Bytes.Decode.Extra.list 5 (Bytes.Decode.unsignedInt32 BE))
--> Just data

Before the release of [elm/bytes], many packages would use List Int to represent bytes. byteValues aids interaciton between those packages and Bytes.

import Bytes.Encode exposing (Encoder)
import Bytes.Extra
import MD5


myEncoder : String -> Encoder
myEncoder string =
    Bytes.Encode.sequence
        [ Bytes.Encode.unsignedInt8 (String.length string)
        , Bytes.Encode.string string
        , Bytes.Encode.Extra.byteValues (MD5.bytes string)
        ]




Bytes.Extra.toByteValues (Bytes.Encode.encode (myEncoder "hello world"))
--> [ 11                                                               -- Length of "hello world"
--> , 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64 -- "hello world" in bytes
--> , 0x5e , 0xb6 , 0x3b , 0xbb, 0xe0 , 0x1e , 0xee , 0xd0             -- |
--> , 0x93 , 0xcb , 0x22 , 0xbb, 0x8f , 0x5a , 0xcd , 0xc3             -- |- MD5 of "hello world"
--> ]