Monad | Functional Monads for PHP | Functional Programming library
kandi X-RAY | Monad Summary
kandi X-RAY | Monad Summary
Functional Monads for PHP
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Top functions reviewed by kandi - BETA
- Sets the type from value
- Checks if value is on native
- Check uniqueness
- Create a new retry .
- Iterate over the collection .
- Return a new instance of the matched value .
- Check if a hash is valid
- Flatten the value .
- Call a function .
- Returns a closure to check if two values are equal .
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Trending Discussions on Monad
QUESTION
I have a function of type 'state -> 'event -> Result<'state * 'result, 'error>. I have a starting 'state and 'event list.
I'd like to fold over the events and get the final state and list of results produced if all folds were okay, or the first error.
I could write a computation expression or fold for it, but was wondering if there was a name for this pattern? Is there something I could use out-of-the-box from FSharpPlus? It seems close to a state monad, but the state and result are both wrapped inside a Result type, so it's sort of a state + result monad?
ANSWER
Answered 2021-Jun-14 at 15:20As @carsten already pointed, you have StateT available in F#+
You have:
'state -> 'event -> Result<'state * 'result, 'error>
Now let's swap some parameters:
'event -> 'state -> Result<'result * 'state, 'error>
this can be expressed as
StateT<'state, Result<'result * 'state, 'error> in current F#+ StateT encoding.
So, let's call your function f and let's pretend you have events which is an list<'event> (or actually any other traversable structure of events) , now you can do this:
QUESTION
I'm trying to set up different Xmonad key mappings depending on the number of connected monitors. The reason is that I use the same Xmonad config file on multiple systems (desktops, a laptop with different monitor configurations including 3 displays). Displays are listed in a different order on different systems, that's why I need to hardcode display indices when using a 3 monitor setup.
My current best try is something like that (everything that is not relevant has been removed):
...ANSWER
Answered 2021-Jun-14 at 10:51not too familiar with Xmonad but you can easily do the following I guess. create a pure function mkConfig which takes the number of screens and returns the desired key mapping. Then, in your main pass it to xmonad function. I haven't tried to compile any of this but probably you can modify it easily
QUESTION
i want to remove the values once user select it from dropdown so that the same value doesn't come on to the next dropdown, but the value which is select disappears on adding the next row or dropdown i mean the placeholder of dropdown goes missing. This is all what i have tried yet and you can find the codesandbox link here
...ANSWER
Answered 2021-Jun-14 at 06:42So first off, you can disable each selectable value based off if the inputs contain the selected value with a computed object
QUESTION
I have a set of functions designed to construct a tree of subtasks from the Asana API. To do this I have a fairly simple module called "Asana.hs", whose most important two functions are these ones using Network.HTTP.Simple to perform the requests:
ANSWER
Answered 2021-Jun-13 at 18:03Instead of
QUESTION
I tried to write a program which takes filepaths as (command line) arguments and returns the first line of each file
...ANSWER
Answered 2021-Jun-12 at 18:14I think you main error is that you messed up with the handle:
QUESTION
Trying to create a reusable collapse component, but having a smooth transition on the element getting a problem. So when the collapse item is clicked i want have a smooth transition
Here is the main part of what i have tried so far.
index.js
...ANSWER
Answered 2021-Jun-07 at 21:27Use viewport units -> 100vh. https://css-tricks.com/fun-viewport-units/
QUESTION
I more or less wrapped my head around monads, but i can't deduct how expression
...ANSWER
Answered 2021-Jun-12 at 06:43This follows from how >>= is defined for the ((->) r) types:
QUESTION
This should be some silly mistake I am doing, but I can't find the problem.
I am making an application that gets an array from the server, then, I display the received data filtered by the user input serch.
If only one country is found in the search, the information for that country is displayed.
...ANSWER
Answered 2021-Jun-11 at 12:56You shouldn't return any view in the handle click. Instead, track the selected country on the click of show button and based on that selection render the country view.
Try this approach,
QUESTION
My problem is how to combine the recursive, F-algebra-style recursive type definitions, with monadic/applicative-style parsers, in way that would scale to a realistic programming language.
I have just started with the Expr definition below:
ANSWER
Answered 2021-Jun-10 at 17:15If you need a monadic parser, you need a monad in your unfold:
QUESTION
I'm stuck on a problem with writing a parser in Haskell that I hope someone can help out with!
It is a bit more complicated than my usual parser because there are two layers of parsing. First a language definition is parsed into an AST, then that AST is transformed into another parser that parses the actual language.
I have made pretty good progress so far but I'm stuck on implementing recursion in the language definition. As the language definition is transformed from AST into a parser in a recursive function, I can't work out how it can call itself if it doesn't exist yet.
I'm finding it a bit hard to explain my problem, so maybe an example will help.
The language definition might define that a language consists of three keywords in sequence and then optional recursion in brackets.
...ANSWER
Answered 2021-Jun-10 at 18:53I believe you can use laziness here. Pass the final parser as a parameter to transformSyntaxExprToParser, and when you see a Recurse, return that parser.
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Install Monad
isolate your tests, at least at the initial stage. If you get a problem, create a test that does one thing - the thing you are trying to debug. Use that as your start point.
be mindful of value() and flatten(), the former gets the immediate Monad value, the latter gives you a PHP fundamental.
when constructing FMatches, ensure the value contained in the FMatch conforms to the type you are expecting. Remember, FMatch returns a FMatch with a value. And yes, I've tripped up on this myself.
keep running the other tests. Seems simple, but in the headlong pursuit of your single objective, it's easy to forget that the library is interdependent (and will become increasingly so as we are able to wrap new functionality back into the original code. e.g. Collection is dependent on FMatch: when FFor is implemented, FMatch will change.) Run the whole test suite on a regular basis. That way you catch anything that has broken upstream functionality. This library will be complete when it, as far as possible, expresses itself in terms of itself!
the tests that are in place are there for a good reason: open an issue if you think they are wrong headed, misguided etc
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