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Hello, First of all, I want to say that LanguageExt is a fantastic library I'm trying to adapt my code to use LanguageExt's functional programming constructs, but I'm not sure how to replace my foreach loop with a more functional approach using LanguageExt. My code involves asynchronous operations that may add data to a database. Here's my current code: foreach (var member in group.GetMembers(true))
{
await _packLicenseRepository.GetCollaborateurAsync(member.Guid.Value, cancellationToken)
.BindAsync(collaborateur => Person.CreatePerson(collaborateur.CollaborateurPk))
.BindAsync(person => serviceStore.AddPerson(pack.PackName, person));
}I would like to refactor this code to eliminate the foreach loop and use LanguageExt's functional methods instead, considering that I'm adding entries to a database. Additionally, I want the processing to continue even if some operations fail, and I wish to collect a list of any errors that occur during the process. Could someone please guide me on how to achieve this? Thank you! |
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Replies: 2 comments 2 replies
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You will need to do a bit of reading on Traversables; but also you should understand applicatives, foldables, and functors. Traversables can work with foldable-sequences of effects and leverage their applicative behaviours to run operations concurrently, but also collect multiple errors. You're not going to get that functionality from the |
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Thx for your response, There's a lot to read also for the Eff part. Do you have a code example with async calls to a database? |
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First off, make sure you have the latest beta, it needed some changes to support this for No, don't use // Two failing Eff effects, note how the Task is lifted into the Eff.
var eff1 = liftEff(e => Task.FromException<int>(Error.New("failed 1")));
var eff2 = liftEff(e => Task.FromException<int>(Error.New("failed 2")));
// Put the two effects into a Seq and Traverse
var eff3 = Seq(eff1, eff2).Traverse(x => x);
// Run the effect to get the result
var res = await eff3.RunAsync();
Console.WriteLine(res); // Fail([failed 1, failed 2])I note you've changed the requirements to "retrieve both errors and successes."; the above will only return either the successes or the failures, not both. You can use var effs = Seq(eff1, eff2);
var res = effs.Map(eff => eff.Run()).Partition(); // (Seq<Error> Fails, Seq<int> Succs)It partitions the results into a tuple of |
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Thx a lot for you time I wil try to switch to the V5 ! |
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First off, make sure you have the latest beta, it needed some changes to support this for
IO-based operations.No, don't use
Map, useTraverse:I note you've changed the requirements to "retrieve both errors and successes."; the above will only return either…