Slicing isn't O(N).
In the current implementation in core, slicing is O(log32n) i believe. In
the next version of Elm, slicing is O(log32n) when start = 0; I'm uncertain
what the big-o notation is once start > 0 though.
fredag 17. november 2017 09.25.22 UTC+1 skrev Francisco Ramos følgende:
>
Hi there,
Was wondering how I can map over an array with a start and end indexes. I
know I could slice the array and then map, but performance is a concern and
slicing is O(N) where N = end - start, plus the actual mapping, another
O(N).
Maybe there is another way where I just loop once over
On Friday, November 17, 2017 at 8:25:22 AM UTC, Francisco Ramos wrote:
>
> Hi there,
>
> Was wondering how I can map over an array with a start and end indexes. I
> know I could slice the array and then map, but performance is a concern and
> slicing is O(N) where N = end - start, plus the
That was a good observation, Rupert. Well, it doesn't return Nothing if the
indexes are out of the bounds, but if start < 0 then start = 0, and end >=
length then end = length -1... I could actually use Array.get and implement
my own map like you mention.
Thanks Robin for that correction. I
I have situation where I have to a jso object similar to this
{ "level": 1, "displayValue": "some text", "dataValue": "a string with the
value" }
{ "level": 1, "displayValue": "some text", "dataValue": { "name": "xxx",
"scope": "" } }
Both cases for dataValue are valid, it can either have
Hi,
Does using Array.indexedMap suit you?
import Array exposing (Array)
submap : Int -> Int -> (a -> a) -> Array a -> Array a
submap start end func =
Array.indexedMap (\i -> if i >= start && i < end then func else
identity)
Of course the result must be of the same type in this case.
On
I have an existing application and I'm trying to add Elm to it. The problem
is that the existing application already has a folder structure and one of
the folders has a space in it.
So when saving a file using vscode I see the following error:
I use webpack 3. I made a component starter for webpack and then included
it in an app starter. App starter included below and it uses
elm-github-install b/c I need to include shared code from private repos.
You might just want the webpack config.
Advantages: webpack can be a nightmare, but
I’m pretty certain you can’t do this in elm. The ellie is for f [] and f
[3,9,2] whereas the question is for f [] and f [3] [9] [2] []
In the latter example, you need f [] to return an integer and f [3] to
return a function that takes two lists of integers and a list of any type
and returns
Hi!
This looks like a bug in the VSCode plugin; elm-make and elm-format can
both handle paths with spaces, so I suspect the VSCode plugin is not
properly quoting the arguments.
Does anyone familiar with the plugin have time to take a look at it?
On Nov 17, 2017 7:19 AM, "Thiago Temple"
The simplest approach would be to use Json.Decode.oneOf along with
Json.Decode.map:
dataValueDecoder : Json.Decode.Decoder DataValue
dataValueDecoder =
Json.Decode.oneOf
[ Json.Decode.string |> Json.Decode.map Val
, ... decode your KeyType record ... |> Json.Decode.map Key
Looks like this version of lazy-list and even lazy itself have been
depreciated, thus my PR is closed.
I also looks like the recommended non-memoizing version of lazy-list has
the same memory leaks for very long (infinite) lists, and thus needs my PR
applied to it.
The rational to depreciating
No, there is no way to do this currently.
You can open an issue on GitHub if you want to discuss further.
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