contra | Asynchronous flow control with a functional taste | Reactive Programming library
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kandi X-RAY | contra Summary
Asynchronous flow control with a functional taste to it.
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- Async object .
- local require function
- variable function
- workaround for all functions
- call fn
- function to run the loop
- do the iteration
- Loops over an object
- Check if a value is set
contra Key Features
contra Examples and Code Snippets
License : Strong Copyleft (CC BY-SA 4.0)
CopygetKeys : Collection -> List String
getKeys None = []
getKeys (Cons name _ rest) = name :: getKeys rest
fromFalse : (d : Dec p) -> {auto isFalse : decAsBool d = False} -> Not p
fromFalse (Yes _) {isFalse = Refl} impossible
fromFaunravelIndex : (order : ArrayOrder) ->
(shape : ArrayShape (S n)) ->
(position : Vect (S n) Nat) ->
Maybe Nat
unravelIndex order shape position =
case decEq (allLessThan position shap data Eventually' {A} (P : A -> Set) (xs : Stream A) : Set where
next : (¬ P (head xs) → Eventually' P (tail xs)) → Eventually' P xs
eventuallyInv : ∀ {A} {P : A → Set} {xs : Stream A} → (ev : Eventually P xs) → Eventually' P xsTheorem even_S (n : nat) : (~even n <-> even (S n)) /\ (even n <-> ~even (S n)). Admitted.
Theorem contra {A B : Prop} (prf : A -> B) : ~B -> ~A. Admitted.
Theorem even_dec (n : nat) : {even n} + theProof3 : (x : Nat) -> (f x = Z) -> (Just 42 = proveMe2 x)
theProof3 x prf with (decEq (f x) Z)
| Yes prf2 = Refl
| No contra = void $ contra prf
Idris> :search LTE k n -> LTE (S k) (S n)
= Prelude.Nat.LTESucc : LTE left right -> LTE (S left) (S right)
If n <= m, then n + 1 <= m + 1
smallerThan (S k) (S n) = case smallerThan k n of
Theorem Sn_le_Sm__n_le_m : forall n m,
S n <= S m -> n <= m.
Proof.
intros n m HS.
assert(Hn: n=pred (S n)). reflexivity. rewrite Hn.
assert(Hm: m=pred (S m)). reflexivity. rewrite Hm.
induction HS.
- (* le_n *) apply Require Import Coq.Logic.JMeq.
Record R (A : Type) (P : A -> Prop) := {val : A; prop : P val}.
Axiom contra : forall A1 A2 P1 P2 (r1 : R A1 P1) (r2 : R A2 P2),
JMeq (val _ _ r1) (val _ _ r2) -> JMeq r1 r2.
Goal False.
assert (H1 :class Contra extends React.Component {
constructor(props) {
super(props);
this.state={
quantity1: "",
data: "", //added a new property to save the `sendOpenPosValueContra`
}
count : (v : Nat) -> (s : NatList) -> Nat
count _ [] = Z
count x (y :: ns) = case decEq x y of
Yes Refl => S (count x ns)
No _ => count x ns
countSingleton : (v : Nat) -> (count v [v]) = S Z
Community Discussions
Trending Discussions on contra
QUESTION
I have two large-ish data frames I am trying to append...
In df1, I have state codes, county codes, state names (Alabama, Alaska, etc.), county names, and years from 2010:2020.
In df2, I have county names, state abbreviations (AL, AK), and data for the year 2010 (which I am trying to merge into df1. The issue lies in that without specifying the state name and simply merging df1 and df2, some of the data which I am trying to get into df1 is duplicated due to there being some counties with the same name...hence, I am trying to also join by state to prevent this, but I have state abbreviations, and state names.
Is there any way in which I can make either the state names in df1 abbreviations, or the state names in df2 full names? Please let me know! Thank you for the help.
Edit: dput(df2)
...ANSWER
Answered 2022-Apr-18 at 03:52Here's one way you could turn state abbreviations into state names using R's built in state vectors:
QUESTION
I have a question, assuming I have a controller with:
-Login -Index -Ventana random -LogOff
And the Ventana random opens in a new tab so we would have two tabs (Index and Ventana random), How can I make it from the Ventana random tab, when pressing the logout button, the Index tab returns to the Login screen ?
Controller:
...ANSWER
Answered 2022-Mar-28 at 20:33If you add a controller action like IsStillLoggedIn that checks if you still have a valid cookie (or whichever authentication scheme you use), perhaps you could use the visibilitychange event on the document in JavaScript - something like this:
QUESTION
I am trying to build regex pattern for the text like that
...ANSWER
Answered 2022-Mar-23 at 05:18I think the key here is to make your regexp do less and your vba do more. What I think I see here is either the word 'mafo' or 'contra' and a number following. Don't know what order or whether each is present or how many times. So you can scan each of your strings for ALL occurrences with a regexp like this:
QUESTION
I have a custom enum class that can only return a specific set of string literals when calling __str__ or __repr__. Given that these serialized string literals are sometimes used as input for other functions (and these inputs are well-typed, ie, restricted to the right set of strings), I want the return type of __str__ and __repr__ to be more precise than str.
Consider the following:
...ANSWER
Answered 2022-Mar-22 at 19:18Your method is typed correctly, but you're conflating repr and __repr__. A().__repr__() returns a Literal["world"] but repr, with signature
QUESTION
i've a unique controller where i control it all my views so from here i've got a problem. After to send data to do login i need obtain a value sended. For example, i've this controller: HomeController, in this controller i've four ActionResult:
ActionResult Index
ActionResult Login
ActionResult Cuotas
ActionResult LogOff
So, when the user login i need obtain here username to verify is already connected from my DB
HomeController:
...ANSWER
Answered 2022-Mar-14 at 18:50If I understand correctly, you need to get your uname that you first post to your Login method and then you need this variable your Cuotas method on the same request when the form is submitted? If that is the case then you have to use Session to persist your variables from one Controller action to another. Your form action is Login method and not Cuotas method so your FormCollection will always be null. So in your case, it would look like:
QUESTION
I would like to figure out pro and contra of different ways to deal with the issue of owning and not-owning raw pointers mixed up, within the pre-C++11 OOP framework that I am using. My role "as framework user" is basically to implement a dozen of abstract classes among the huge class hierarchy provided by the framework. This framework (and the "user code examples" from which I start):
- extensively create objects in the heap via factories/singletons or explicit
new, and most of these objects are managed by the framework but others are users' responsibility - and you have to inspect the examples user code and cross-check the thick user manual to be sure which - examples suggests to embed other classes in your implementation classes always via pointer (which you create in constructors in the proper way and, if you are the owner, delete in destructor)
- all interrelation between classes is via pointer, I mean that most of the methods takes non-owning raw pointers as parameter to the objects that they have to use.
In MY user code I want to achieve the following GOALS in order of priority:
- Clearly mark which member pointer is an owning pointer, so that I do not have to go through the manual every time that I read again a piece a code
- Have a safer code
- Have a simpler/more readable/more maintainable code
I consider the following options for all member objects of my implementation classes:
A) all owning raw pointers (clearly detectable by the delete in the destructor but also always cross-checked with the user guide) replaced with unique_ptr.
PRO I achieve all (1), (2) and (3), as e.g. I kick out the trivial destructor, etc
CONTRA I have to add .get() at every call of the framework methods (plus sometimes some .reset() when initlization cannot happen in-class/in-initializer-list), which at least at the first glance looks weird, but maybe one has just to get used to.
B) the "softer" approach of the "Guideline Support Library" owner "tag".
PRO at least I achieve (1), without diverging too much from the "framework guidelines".
CONTRA I give up with (2) and (3). Further developments will inherit further on this legacy
C) why should I have pointers at all, and not just embed the object inside??? I should get the exact PRO and CONTRA as option (A) - just & to add instead of .get() -, right???
Of course the approach departs more substantially from what the framework suggests.
This is what I have found so far, any further overlooked details (especially warnings) or suggestions are really welcome.
...ANSWER
Answered 2022-Mar-14 at 11:29A) all owning raw pointers (clearly detectable by the delete in the destructor but also always cross-checked with the user guide) replaced with unique_ptr.
CONTRA I have to add .get() at every call of the framework methods (plus sometimes some .reset() when initlization cannot happen in-class/in-initializer-list), which at least at the first glance looks weird, but maybe one has just to get used to.
I would definitely recommend this approach. If you are bothered by the get and reset calls, you can define your own wrapper that has implicit conversions. Less safe, still better than the old state. Something like this:
QUESTION
I want to discuss wether good or bad idea:
I got a MySQL DB and created a common table "user" to authenticate an login.
...ANSWER
Answered 2022-Feb-11 at 14:25The primary weakness is that you pass the password in plaintext when you create the row, and every time you call your checkUserAuth() function.
This can be wiretapped (unless you ensure using SSL connections between app and database) and it will be written to the query log if you have the query log enabled. It's also visible in the processlist and the performance_schema statements history tables.
This is a good reason to do the hashing in the client, and send only the salted hash of the password when you create the row. When you authenticate, fetch the salted hash from the database, and validate it against user input in the client.
QUESTION
I add the toArray() method because I need the result in an array format; it displays the error below. So I wonder how I can fix it? How can I create that query in an array?
ANSWER
Answered 2022-Feb-10 at 13:32if you want to use toArray()
QUESTION
ANSWER
Answered 2022-Jan-12 at 22:20Turns out the problem wasn't with the LazyColumn, it was with each row. As you can see StationListItem() creates LazyRows but really it should be creating Rows because I'm not trying to create a horizontally-scrolling list.
I also (embarrassingly) had the overflow property set on the wrong Text field. Switching it to the correct one and adding maxLines = 1 truncated the text with "..." as desired.
Fix is to change the StationListItem function to the following:
QUESTION
My code looks something like this at the moment:
...ANSWER
Answered 2022-Jan-06 at 17:40Perhaps there is a better solution, but you could use the parameter optionsAfterRender in the Options binding in order to modify the tag:
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