Enhancing user experiences with reactive extensions tccc10

ENHANCING USER EXPERIENCES WITH REACTIVE EXTENSIONS

Bryan Anderson

What is Rx?

Reactive Extensions are a set of extension methods that allow you

to compose and operate on streams with LINQ operators in the same way you would a list.

Compose and operate on streams? Sounds like it’s time

for me to take a nap.

Streams?

A stream can be thought of as a list of events that take place over

time.

Compose?

Sticking functions together, like Legos. Say we have two functions

f and g.Math: f(g(x))Unix: x | g | f

What is Rx?

Reactive Extensions are a set of extension methods that allow you

to compose and operate on streams with LINQ operators in the same way you would a list.

It’s too early to think abstractly and a nap sounds

really good right now.

IObservable vs IEnumerable

IObservable and IEnumerable are mathematical duals. Which just means they’re equivalent. Every IEnumerable could be turned into

an IObservable and vice-versa (with enough time).

If they’re equivalent what does IObservable give us?

IObservable vs IEnumerable

IEnumerable let’s you pull items from it.

IObservable pushes items to you.

IObservable vs IEnumerable

When it comes down to it

IObservable = IEnumerable + Time

Marble Diagrams

Running observable:Completed normally:Completed with an exception:

Input goes above output:

I think you’ve lost your marbles.

Questions so far?

Please feel free to ask questions as we go.

The LINQ you’re used to

Common LINQ queries work the same Select Where First Skip Take

Time adds more options

Throttle Delay BufferWithTime, BufferWithCount Scan Zip, Merge, CombineLatest

Dude, this is a CODE camp. You need to stop talking and

show me some code!

Questions?

I love feedback!

Bryan Andersonbryan.anderson@ilmservice.com

@SolaAesir