ObjectC | C language adding a lot of modern concepts

I recommend not using IAsyncCollector at all. The providers for IAsyncCollector don't have many knobs for configuration:

• Serialization
• Batching
• Retries
• Error handling

What's more, some implementations have changed these implementation details between releases without warning. For these reasons, I recommend never using IAsyncCollector and just using the APIs directly, where you have full control over all of these aspects. IAsyncCollector is a nice abstraction, but it's precisely that abstract nature that makes it unsuitable in the end.

This is not going to work with streams, streams are suitable to process homogenous data, which this isn't.

Step 1 is to turn your lists into maps, mapping id to the object in question.

Then, armed with the 3 maps, you can merge. First make a superset of all IDs, then for each ID, gather up your data, and create your object.

Something like:

It seems that you can leverage using SelectMany to flatten the nested collections. Should look something like this:

"...if the priority doesn't match the condition, the object should be filtered out from the array"

Looks like you're mixing two operations into one. The more straightforward way is to filter the array first and then sort it.

Something like this:

Ok, I have found a solution:

A singleton with no state will not have any thread safety issues

For ICollectionView implementations which support sorting (identifiable by the CanSort property), we can assign an implementation of IComparer to the ICollectionView.CustomSort property.

Since our underlying collection is simply IEnumerbale, we can use an existing implementation of System.StringComparer from the System.Runtime.Extensions.dll assembly:

Assuming the array is objectC you can do something like:

Text(objectC.isEmpty? "" :objectC[0].name)

You can read more about ternary operators in dart here

You are comparing string(expectedKeys[i])with number(length) . Javascript won't give you an error but it will always evaluate to false. Also you have put a return inside a for loop which breaks the loop when it is encountered.