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elmlang | general | in there, you have a list with `Html msg` inside (`mainNav ...`) and next to it `List (Html msg)` (that's the `pageContent`) | 2019-03-27T15:31:46.857300 | Florencia |
elmlang | general | in Elm, all elements of lists have to be of the same type | 2019-03-27T15:32:02.857800 | Florencia |
elmlang | general | think of it as `[1, [2, 3]]` | 2019-03-27T15:32:24.858300 | Florencia |
elmlang | general | so either you can do `1 :: [2, 3]` or `[1] ++ [2, 3]` | 2019-03-27T15:32:42.858700 | Florencia |
elmlang | general | that' too didn't work | 2019-03-27T15:32:51.859200 | Leopoldo |
elmlang | general | to get `[1, 2, 3]` | 2019-03-27T15:32:54.859300 | Florencia |
elmlang | general | wait, where? | 2019-03-27T15:32:59.859500 | Leopoldo |
elmlang | general | for `1 :: [2, 3]` or `[1] ++ [2, 3]` | 2019-03-27T15:33:13.859800 | Leopoldo |
elmlang | general | in line 188, you have to somehow cobine `mainNav ...` and `pageContent` into one list | 2019-03-27T15:33:30.860400 | Florencia |
elmlang | general | either `mainNav ... :: pageContent` or `[mainNav ...] ++ pageContent` | 2019-03-27T15:33:50.860800 | Florencia |
elmlang | general | ok, let me check that | 2019-03-27T15:34:22.861100 | Leopoldo |
elmlang | general | (sorry, that metaphor with numbers probably didn't help :sweat_smile: ) | 2019-03-27T15:34:38.861600 | Florencia |
elmlang | general | i was rather coning or concatenating at other sections | 2019-03-27T15:34:41.861800 | Leopoldo |
elmlang | general | oh, it went bad again | 2019-03-27T15:36:13.862100 | Leopoldo |
elmlang | general | The 1st argument to `heroDiv` is not what I expect:
188| [ heroDiv [ mainNav model.route model.viewport :: pageContent ] ]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This argument is a list of type:
List (List (Html Msg))
But `heroDiv` needs the 1st argument to be:
List (Html Msg) | 2019-03-27T15:36:28.862500 | Leopoldo |
elmlang | general | that's what has been happening, i have been rotating or juggling signatures and lists, | 2019-03-27T15:37:07.863100 | Leopoldo |
elmlang | general | `mainNav ... :: pageContent` creates a list | 2019-03-27T15:38:35.863700 | Florencia |
elmlang | general | and you're wrapping that in yet another list | 2019-03-27T15:38:42.864000 | Florencia |
elmlang | general | so that outer one can go away | 2019-03-27T15:38:46.864300 | Florencia |
elmlang | general | (eg. be replaced with parentheses) | 2019-03-27T15:38:53.864500 | Florencia |
elmlang | general | OK | 2019-03-27T15:39:22.864800 | Leopoldo |
elmlang | general | thanks a lot, it works | 2019-03-27T15:48:22.865000 | Leopoldo |
elmlang | general | you're welcome :slightly_smiling_face: the error messages usually give you all the info you need! | 2019-03-27T15:49:30.865600 | Florencia |
elmlang | general | some infos are tough to decrypt :slightly_smiling_face: | 2019-03-27T15:52:12.865900 | Leopoldo |
elmlang | general | im trying to create a custom fuzzer for a union type. Say i have `Number = One | Two | Three` how can i create a function - which generates a list of all elements as in: `[One, Two, Three]` but i want this list built programmatically? I want to not think about adding `Four` to the list manually because for sure im gonna forget it. I much rather let the compiler do it for me. So how is this possible? | 2019-03-27T15:58:39.868800 | Yang |
elmlang | general | why can't i `{ guy.address | city = "San Francisco" }` | 2019-03-27T16:02:18.869700 | Nery |
elmlang | general | i must instead do
```
let
addr = guy.address
in
{ addr | city = "San Fran" }
``` | 2019-03-27T16:02:51.870400 | Nery |
elmlang | general | <@Nery> IIRC there"s no reason it shouldn't be technically possible, it's just language syntax decision | 2019-03-27T16:04:05.872000 | Florencia |
elmlang | general | can't find the discussion with the rationale though | 2019-03-27T16:04:28.872900 | Florencia |
elmlang | general | ultimately i'd like `{ guy | address = { guy.address | city = "SF" }}`
thx <@Florencia> you thinking purposeful decision or incidental | 2019-03-27T16:04:33.873100 | Nery |
elmlang | general | ah k purposeful.. thx | 2019-03-27T16:04:39.873300 | Nery |
elmlang | general | <@Yang> you can't create it programatically (I'd also love it if that was possible). Create the list yourself and have a function nearby that pattern matches on the type and returns "Yes I've added a new element to the enumeration above" :D (The compiler will warn you when you add `Four` to the type, because of that function) | 2019-03-27T16:07:07.877200 | Florencia |
elmlang | general | ```
numCheck : Number -> String
numCheck num =
case num of
One -> "I swear I did it"
...
``` | 2019-03-27T16:08:55.878500 | Florencia |
elmlang | general | yep, thanks did that for now.. hmm would be awesome to have some more meta-programming abilities in elm :smile: | 2019-03-27T16:11:30.879300 | Yang |
elmlang | general | Hi,
I wanted to as about decoding `json` to `dict`. Specifically why, when I run the decoder, there is `Dict.fromList` rather then `Dict`? | 2019-03-27T16:15:02.881000 | Hang |
elmlang | general | You mean when using `Debug.log`? | 2019-03-27T16:15:53.881600 | Huong |
elmlang | general | Well that was when I've noticed it, now, I've tried to replicate it in repl and it appears to still be there | 2019-03-27T16:16:43.881800 | Hang |
elmlang | general | Right, that's just the way Dict's are shown in human readable form | 2019-03-27T16:20:46.882500 | Huong |
elmlang | general | It's either that, or using made-up syntax which doesn't exist in Elm, or exposing the internal implementation details (which would be strange) | 2019-03-27T16:21:26.882700 | Huong |
elmlang | general | So don't worry about it, it's just Elm trying to be helpful :slightly_smiling_face: | 2019-03-27T16:21:41.882900 | Huong |
elmlang | general | There is one more option - if you don't mind writing an exhaustive function and calling it with a helper - <https://ellie-app.com/56jJ646mszfa1> | 2019-03-27T16:22:24.883100 | Huong |
elmlang | general | we could potentially show a dict like this:
```
"one" | 1
"two" | 2
```
But would b a pain in the ass to parse. If you copy paste the Dict.fromList example you endup with valid elm code. What i have above is not elm syntax .. is just something easy to see. So is not useful as code. Maybe this is part of the reason. | 2019-03-27T16:22:34.883300 | Yang |
elmlang | general | you can still mess it up, of course, but at least the compiler can remind you | 2019-03-27T16:23:10.883500 | Huong |
elmlang | general | Ok. thanks :slightly_smiling_face: | 2019-03-27T16:31:27.883700 | Hang |
elmlang | general | yeah those two ways essentially just buy the compiler check | 2019-03-27T16:34:51.883900 | Florencia |
elmlang | general | what are popular remoting / RPC alternatives for elm except JSON RPC. Preferably something that has an Interface Description Language (IDL) ? | 2019-03-27T18:53:00.885700 | Carter |
elmlang | general | GraphQL? | 2019-03-27T23:44:34.000100 | Nana |
elmlang | general | ```> x = -2175897600000
-2175897600000 : number
> x // 1000
2119069696 : Int
> x / 1000
-2175897600 : Float```
can someone please explain this output to me? the bottom number is the correct value, but I want it as an Int. Thought // was the way to do that, but it gives a different value. Don't really understand that value though. It should be the same value AFAIK. | 2019-03-28T01:32:04.000800 | Nga |
elmlang | general | Is this an Elm bug or am I misunderstanding //? | 2019-03-28T01:33:18.001100 | Nga |
elmlang | general | Interesting. Apparently that's causing a silent overflow wrap. Found this: <https://github.com/elm/compiler/issues/1832>
```This was "solved" by defining -2^31 to 2^31 - 1 as safe range for Int math operations. Time.posixToMillis returns larger values, so math operations on those values are not safe.```
That answers my question. | 2019-03-28T01:40:51.001800 | Nga |
elmlang | general | Hey peeps, not sure if this is the correct channel for this but I have noticed that there is no `South African` channel on this elm slack. Any others from South Africa that would be keen to have a channel where we could post meetups and get the community together over here? | 2019-03-28T03:31:53.003200 | Kami |
elmlang | general | I think you can request new channels in <#C3FKL0A8H|admin-help> | 2019-03-28T04:32:12.003900 | Earnest |
elmlang | general | Is there any way to get a task from a random generator on 0.19? | 2019-03-28T05:24:00.004900 | Kimbery |
elmlang | general | (I saw <https://package.elm-lang.org/packages/NoRedInk/elm-random-extra/latest/Random-Task> but it's 0.18) | 2019-03-28T05:24:38.005300 | Kimbery |
elmlang | general | There is, but it's not something I'd recommend, as it essentially means the "random" result is just a function of time.
The trick is to use `Time.now`, turn that into an Int (`Time.posixToMillis`), into a seed (`Random.initialSeed`) and run the generator with that | 2019-03-28T05:28:34.005400 | Huong |
elmlang | general | 0.16 even :smile: | 2019-03-28T05:29:21.005600 | Huong |
elmlang | general | ahaha, right | 2019-03-28T05:30:40.005800 | Kimbery |
elmlang | general | On a related note, when you land on a package via google there's currently no way of knowing which versions of elm it's compatible with (e.g. <https://package.elm-lang.org/packages/NoRedInk/elm-random-extra/latest/Random-Task>). AFAICT clicking through to the repo and checking elm-package.json or elm.json is the fastest way to find out. Has there been any discussion about adding the elm versions to the package page? | 2019-03-28T05:32:50.007500 | Kimbery |
elmlang | general | what do folks use to write tests for json decoders? elm test (elm-explorations/test) or something else? Thx | 2019-03-28T06:22:11.008700 | Allie |
elmlang | general | I haven’t tested my decoders, but elm-test would be my way to go. | 2019-03-28T06:24:35.008800 | Timika |
elmlang | general | if you have matching encoder/decoder pairs, a fun test is to generate random data, encode it, decode it, and check that the decoded result is equal to the original input | 2019-03-28T06:25:24.009000 | Huong |
elmlang | general | <@Timika> thanks | 2019-03-28T06:26:27.009200 | Allie |
elmlang | general | <@Huong> nice idea. Don't have the (function + inverse) pattern unfortunately but thanks for suggestion | 2019-03-28T06:27:21.009400 | Allie |
elmlang | general | <https://discourse.elm-lang.org/t/put-a-banner-on-elm-lang-packages-mentioning-0-18-version/3341/2> | 2019-03-28T06:49:14.009700 | Velia |
elmlang | general | <https://github.com/elm/package.elm-lang.org/pull/285> | 2019-03-28T06:50:06.009900 | Velia |
elmlang | general | Is there an easier way to do something like this? Making a function that compares two types but ignores values
```match : Route -> Route -> Bool
match one two =
case one of
Home _ _ ->
case two of
Home _ _->
True
_ ->
False
Blog _ ->
case two of
Blog _ ->
True
_ ->
False
``` | 2019-03-28T08:41:19.010800 | Nga |
elmlang | general | You can match on a tuple of `one` and `two`, like
```
match : Route -> Route -> Bool
match one two =
case (one, two) of
(Home _ _, Home _ _) -> ...
``` | 2019-03-28T08:45:23.012100 | Jin |
elmlang | general | Home and Blog are actually values here, not types, but we get what you mean | 2019-03-28T08:47:01.012700 | Sharon |
elmlang | general | It's a worthwhile distinction actually, because I need a value to do comparisons. Thanks <@Jin> that does help. | 2019-03-28T08:48:17.013400 | Nga |
elmlang | general | is there a String size limit or a limit to a string size when set over the program Flags ? | 2019-03-28T09:20:48.014200 | Sharri |
elmlang | general | I'm having a weird issue where I send a large blob of text as flags and only parts of the string get to Elm | 2019-03-28T09:21:09.014700 | Sharri |
elmlang | general | It's just passed along, so that would be the string size limit of the JS VM. Which large enough you're exceedingly unlikely to bump into it | 2019-03-28T09:24:29.014800 | Huong |
elmlang | general | That seems weird. Is it actual text, or ..? How are you checking the contents and noticing the difference? | 2019-03-28T09:25:15.015500 | Huong |
elmlang | general | I'm taking some text I output from the server into a div, reading the text with .innerHTML, decoding html entities and the passing it to elm | 2019-03-28T09:26:08.016400 | Sharri |
elmlang | general | I can print the text with `console.log` before passing it and it is exactly what I expect | 2019-03-28T09:26:28.016900 | Sharri |
elmlang | general | probably it has to do with wrong html decoding, but I just find weird that the string is just truncated on th elm side with no warning | 2019-03-28T09:27:38.017500 | Sharri |
elmlang | general | Elm doesn't do random string truncation, as far as I'm aware. if you could try to get a minimal example of your issue running on Ellie, I'd be happy to take a look! | 2019-03-28T09:28:27.018500 | Huong |
elmlang | general | I need to take a break now, but I'll get to it when I'm back | 2019-03-28T09:29:05.018900 | Sharri |
elmlang | general | thanks for your help | 2019-03-28T09:29:09.019100 | Sharri |
elmlang | general | so uh, fun warning: Firefox 66 breaks websockets on localhost. If you find your hot reloading stop working ... that might be why. <https://support.mozilla.org/en-US/questions/1253577> | 2019-03-28T10:39:53.019900 | Gertrude |
elmlang | general | hey everyone, im trying to make a function that counts how many digits exist after dot in a floting point number.
i have 2 tests:
```
-- 8 digits
, test "1.12345678 has 8 digits after dot" <|
\() ->
Utils.countDigitsAfterDot 1.12345678
|> Expect.equal 8
-- 9 digits
, test "1.123456789 has 9 digits after dot" <|
\() ->
Utils.countDigitsAfterDot 1.123456789
|> Expect.equal 9
```
The function is:
```
countDigitsAfterDot : Float -> Int
countDigitsAfterDot float =
let
recursiveCreature : Float -> Int -> Int
recursiveCreature nr acc =
if exactFloat nr then
-- we reached the end
acc
else
recursiveCreature (nr * 10) (acc + 1)
in
recursiveCreature float 0
exactFloat : Float -> Bool
exactFloat f =
toFloat (floor f) == f
```
This is my implementation. But is not working for the 9 digit. It sais i have 14 digits. not 9. So how is this possible? I mention that it works for all cases but only up until 8. As soon as i reach 9 digits its messed up. Any insight into whats happening here? | 2019-03-28T11:40:38.023600 | Yang |
elmlang | general | thanks:) | 2019-03-28T11:40:46.023800 | Yang |
elmlang | general | could it be because of binary/decimal conversion? | 2019-03-28T11:43:39.023900 | Nana |
elmlang | general | for example `0.1 + 0.2 == 0.30000000000000004` | 2019-03-28T11:43:59.024100 | Nana |
elmlang | general | yep just tested a few of this.. is rely wired. for example - a `0.00000000000001` has 14 digits but it sais it has 30.. | 2019-03-28T11:45:36.024300 | Yang |
elmlang | general | and if you go over 15 .. elm format removes them, and doesnt let you type a higher number. | 2019-03-28T11:46:33.024500 | Yang |
elmlang | general | actually no. over around 30 seems like. is when elm format removes it. | 2019-03-28T11:47:32.024700 | Yang |
elmlang | general | I think recursively dividing by 10 is bound to cause problems | 2019-03-28T11:47:48.024900 | Nana |
elmlang | general | better to convert it to a String and then count the digits | 2019-03-28T11:48:52.025200 | Nana |
elmlang | general | need to think of a differen timplementation then.. let me know if you have a better suggestion :slightly_smiling_face: | 2019-03-28T11:49:15.025400 | Yang |
elmlang | general | aha.. ok gonna see if that works. | 2019-03-28T11:49:25.025600 | Yang |
elmlang | general | Hey all, I'm trying to understand how virtualized lists can work in Elm. A virtual list being a list that doesn't show all it's rows at the same time.
Is there something like this (<http://bvaughn.github.io/react-virtualized/#/components/List>) that already exists for dynamically sized content?
Imagine a chat room, with a bunch of messages. Basically a list with each row being a message of text. The rows are dynamically sized because we don't know the size until the browser renders it.
The current virtual list implementations I've seen require knowing the size of the rows. Which doesn't work for this problem. Is there some other project I've missed, or is there another way of doing this? | 2019-03-28T11:57:11.029400 | Linda |
elmlang | general | pff disaster, it oconverts it to floating scientific notation..:
```
> 0.00000001 |> String.fromFloat
"1e-8" : String
``` | 2019-03-28T11:59:14.029500 | Yang |
elmlang | general | You could create a capped list, don’t you? | 2019-03-28T12:01:34.030000 | Ghislaine |
elmlang | general | What is a capped list? Do you mean just truncating the list? | 2019-03-28T12:02:03.030200 | Linda |
elmlang | general | Yeah | 2019-03-28T12:02:29.030400 | Ghislaine |
elmlang | general | I mean, its not the same as having a virtualized list of components but it could do the job. | 2019-03-28T12:03:42.030600 | Ghislaine |
elmlang | general | That's not quite what I want. The user should be able to scroll all the way up to the first message, and then all the way down to the last message. They should have access to all the items in the list. The VirtualList would do the hard work of just rendering just the visible rows. | 2019-03-28T12:04:01.030800 | Linda |
elmlang | general | if someone scrolls to the top then u load the older messages | 2019-03-28T12:04:05.031000 | Ghislaine |
elmlang | general | and so on | 2019-03-28T12:04:27.031200 | Ghislaine |
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