Want to know when I need to use flatMap

[lohanrakesh]

Hi @scotteg

just want to know when I should use flatMap and can I use flat map without having return type observable

flatMap {
$0.score.asObservable()
}

I need some reason to implement it. Please help me .

Thanks

~

[syedfa]

@lohanrakesh. Thanks very much for your question! With respect to using flatMap:

When you need to transform the contents of an array of arrays, into a linear array use flatMap:

eg.

let users: [User] = …
let allEmails = users.flatMap { $0.emails }

In the above example, I’m not using a return type observable, so this should be a good example.

I hope this helps!

All the best!