0, 1 and bit lists of sizes that don't have to be multiples of 8.
import Bit exposing (Bit(..))
import Bits
-6 |> Bits.fromIntSigned 5
--> [ I, I, O, I, O ]Use when correctness/precision matters more than raw speed.
Most id types use an opaque type to hold information.
Example similar to danyx23's Uuid to skim through ↓
module OpaqueId exposing (OpaqueId, generate, toString)
type OpaqueId
= OpaqueId String
toString : OpaqueId -> String
toString =
\(OpaqueId string) -> string
generate : Random.Generator OpaqueId
generate =
Random.map
(\fifteenHexDigits ->
OpaqueId
([ fifteenHexDigits |> List.take 4 |> List.map mapToHex |> String.fromList
, "-"
, fifteenHexDigits |> List.drop 8 |> List.take 4 |> List.map mapToHex |> String.fromList
, "-"
, "4"
, fifteenHexDigits |> List.drop 12 |> List.take 3 |> List.map mapToHex |> String.fromList
, "-"
, fifteenHexDigits |> List.drop 15 |> List.take 1 |> List.map limitDigitRange8ToB |> List.map mapToHex |> String.fromList
]
|> String.concat
)
)
(Random.list 15 (Random.int 0 15))with bits:
module MyId exposing (MyId(..))
import Bit exposing (Bit)
import Vector60
type MyId
= MyId (Vector60 Bit) -- depending on necessary bitsNotice how extracting information is easy and to creating a new id can be done safely (without e.g. requiring going through decoders, parsers, validations, opaque random generators etc.).
🧩 Vector60 is from Chadtech/elm-vector
but anything will do the job, like a record, custom codegen or lue-bird/elm-typesafe-array.
Hell even if you just use an opaque List Bit you'll still have it easier than with a String.
Bits as a universal way of representing information can be converted from and to basically any shape → example
- different string formats like human-readable (for example michaelglass/proquint), less character space, hexadecimal, ...
- colors, shapes, identicons like
coinop-logan/phace,
laurentpayot/minidenticons-elm
or forks of pukkamustard/elm-identicon
(like dividat/elm-identicon),
miniBill/elm-avataaars, ...
elm-morphcan create a parser-builder that can even read non-byte-multiple bit counts like 7- maybe you built something? Tell me about it ✿
Confused? Hyped? Hit @lue up on anything on slack