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Your code/View is missing the if-condition to know what shall happen when the selectorIndex is 0 or 1.

It has to look like this:

Many classes in UIKit uses this "data source" pattern to populate themselves with data. Other than UITableView, there's also UICollectionView, UIPickerView and UIPageViewControllerDataSource, just to name a few. What is said in this answer can also be applied to those classes too.

Instead of making you give it all the data all at once, UITableView asks for the data only when it needs. This is because sometimes the data could be, say, on the Internet, fetching them all at once could take a long time, couldn't it?

Okay, so who should the table view ask for the data? The dataSource! How does the table view know that its data source can answer its questions? By ensuring that the data source conforms to the UITableViewDataSource protocol, which defines a bunch of methods.

Therefore, tableView.dataSource = self is saying:

Hey tableView, if you want to ask for the data, just ask self (the ChatViewController)!

By implementing UITableViewDataSource, we are saying that this class is able to provide answers to table view's questions.

How do we actually provide the answers? By implementing the data source methods!

Your assumption is correct, the issue is with filter() in reduce().

So Array.prototype.reduce() takes 2 arguments:

1. The first is the accumulator, in your case finalGroups[0].data which looks okay.
2. The second is the current value from the iteration - filter variable.

So in your case I guess the issue is that as the error message states that filter is not a function. Technically filter in this case one element from prepareList array.

For Array.prototype.filter() you need to pass a function which return true or false value, from the documentation:

The filter() method creates a new array with all elements that pass the test implemented by the provided function.

Think about the following solution:

EDIT:

After adding other classes to the project I encountered the same problem again and realized that conversion was not the problem.

The problem was that I have an enumeration named Error, that's why the parameter error: was not recognizing the Swift Error class, so the warning was correct.

I came to edit the answer and I saw that Boris Y. wrote the fix for this, so I'll accept his answer.

You can create a custom protocol for you KeyboardToolBar

The issue is with isEnable property used isUserInteration property instead of that

The second argument label must be 'bundle', not 'Bundle,' see https://developer.apple.com/documentation/uikit/uinib/1614135-init.

Are you aware, that you have a empty else branch and an independent second if statement? I am quite sure, you want an else if-state meant instead

Also the test if delegate is nil isn't needed.

I think you have messed up in the sendMessage(), I cannot work out the replyHandler syntax, and you miss the errorHandler: parameter.

Anyway, I've tried your code, and with a few changes it would work.

1). In InterfaceController, the sendPressed():