Relating to the open-source C# functional framework: language-ext.
Questions tagged [language-ext]
66 questions
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Is there a way of passing extra data to the Left lambda in Match without having to add it to every intermediate method?
Suppose I have a method that takes the Id of a card issuer (think of loyalty cards for shops), and I want to get the status of the customer who made the most recent transaction. Yes this is a silly scenario, but it's easer than trying to describe…
Avrohom Yisroel
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1 answer
Get Right value from LanguageExt c#
I have method that returns:
Either result = GetResult();
I need to return right value: (int NextDelayMs, int NextRetryCount)
But I can't figure out how to do it.
I tried:
var toReturn = result.Map(x => x.Right);
but…
user122222
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Unwrapping multiple TryAsync
cIn haskell i can have :
do
result1 <- IOaction1
result2 <- IOaction2
doSomethingWith result1 result2
How can i achive this in C# with LanguageExt ?
Edit
EitherAsync x = TryAsync(new…
Bercovici Adrian
- 8,794
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How to use switch on the value with an Option?
I am using LanguageExt but I suspect the same question applies to other FP languages. I got myself in the situation below and would love to have some advice:
Check the value in an Option
Depending on the value, a different function is applied
The…
DavidY
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0
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1 answer
How do I extract the value from a LanguageExt Validation?
I am learning about LanguageExt and using functional programming styles in C#. I have created a new class, with my goal being a ValueObject:
public sealed class AlertDefinition : NewType
{
private…
TortillaCurtain
- 501
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0
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1 answer
Call Langext MapAsync only if Option is Some value and not None
I use LangExt library and i have the case of no user exists with UserId 1.
public async Task GetUser()
=> await GetUser(1)
.MapAsync(this.alterName)
.MapAsync(this.alterCountry)
…
EagerToLearn
- 89
- 12
0
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1 answer
Language-ext: chain Either with Option?
I am just starting with language-ext, trying to use it in my Azure Function.
In this function, I first parse/validate the POSTed data from the HTTP request using some validator.
This validator returns an Either.
Then…
Para Jaco
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0
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1 answer
Language-ext Aggregate exceptions/failures when Try>>
I am fresh new with the brilliant language-ext c# library.
I have this code that returns a Try> object:
Try(DetectAlertsToNotify)
.MapT(SendNotification)
//treat errors happened indifferently…
maxence51
- 994
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0
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2 answers
Functional Programming in C# with Language-ext
I have recently started working on a new DotNet Core project. I had noticed that someone (developer) used the Language-Ext library in this project. It was a new thing for me so I got to know that it is for Functional programming. It was quite…
KiddoDeveloper
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1 answer
LanguageExt: How do I do the equivalent of Option.Match with a [Union]?
I want to create a union that will act a bit like Option, but that allows a 3-way state, rather than a 2-way state. The reason for this is to use it when loading data from a database.
If I were doing this with an Option, I would do something…
Avrohom Yisroel
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0
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Return IEnumerable of a property of the Key in a Map
Suppose I have the following classes:
public class X
{
public string a;
public string b;
}
public class Y
{
public string c;
}
and I have a Map:
var myMap = Map();
How do I return a list of a (IEnumerable) from this?
I am…
joe_maya
- 185
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0
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1 answer
Language-Ext Unions - Target runtime doesn't support default interface implementation
I'm trying to user the Union type in Language-Ext and am getting error: "Target runtime doesn't support default interface implementation" for the method name and "The type or namespace name 'InconsistentFirstName' could not be found"
My code looks…
Dennis
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- 9
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2 answers
LangageExt: Chaining of two Eithers with Bind(), but cannot figure out how to use them to create another Either
I am using LanguageExt to have functional programming features in C#. I have a method in which I want to build an instance of VaultSharp to access our HashiCorp Vault service. My goal is to create an instance of VaultClientSettings (see methods…
A Bit of Help
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How to bind on multiple Either<,>?
I have two functions that return Either, and the 2nd function depends on the first one.
Either either1 = ReturnEither1(...);
Either either2 = either1.Bind(ReturnEither2);
Now, I have a 3rd function which depends on…
David S.
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0
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1 answer
Convert Either> to Option> in c# LanguageExt
I'm using C# LanguageExt https://github.com/louthy/language-ext
I have a class MyDto parsed from some Json. The parsing functions returns Either.
If the dto matches a given rule, or it is an error, then I would like to get back the…
Luca Piccinelli
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