Hex.Convert
Hex.Convert
is a small package for working with elm/bytes
.
It exposes three functions.
toString : Bytes -> String
toBytes : String -> Maybe Bytes
blocks : Int -> String -> List String
The toString
function converts a Bytes
value into
its hexadecimal representation, assuming this exists.
For example,
something like "6A45F2"
. The toBytes
function converts a string like
"6A45F2"
to a value of type Maybe Bytes
. Such a function
call can fail, e.g., on the input "6A45F!"
. The blocks
function
is useful for grouping a long string into shorter substrings of equal length.
Examples
Hex.Convert.toBytes "FF66"
|> Maybe.map Hex.Convert.toString
--> Just "FF66"`
$ elm repl
> import Hex.Convert
> import Bytes.Encode as Encode exposing(encode)
> encode (Encode.string "Hello")
|> Hex.Convert.toString
"48656C6C6F" : String
> Hex.Convert.toBytes "FF66"
|> Maybe.map Hex.Convert.toString
Just "FF66" : Maybe String
> Hex.Convert.toBytes "FF66!!"
|> Maybe.map Hex.Convert.toString
Nothing : Maybe String
> "abcdefghijklmnopqrstuvwx1234"
|> Hex.Convert.blocks 4
["abcd","efgh","ijkl","mnop","qrst","uvwx","1234"]
## Notes
The function `Hex.Convert.toBytes` is case-insensitive. Thus
Hex.Convert.toBytes "ff66"
|> Maybe.map Hex.Convert.toString
--> Just "FF66"
If you prefer lower-case output from `Hex.Convert.from`,
you can do as in this example:
Hex.Convert.toBytes "ff66"
|> Maybe.map Hex.Convert.toString
|> Maybe.map String.toLower
--> Just "ff66" : Maybe String