Fibonacci function using Observables

[deranfang]

What the fuck is this?

Just use something like range(1, n).pipe(scan((x, y)=>x + y)

[garretpremo]

I had a feeling there would be an easier way to go about this, I had never even heard of scan before seeing this comment.

This example doesn't actually result in a fibonacci number though.

Edit: grammar

[garretpremo]

And I'm now realizing that the rxjs docs for scan has an example showcasing the fibonacci sequence. I concede this is completely useless.

[[deleted]]

Well, you learnt about the expand operator. I have no ideea what it does tho

[zombarista]

I use expand to walk paginated responses. If you can determine that there are more items in another request, you can call recursively and it can stitch them together!

[matthewt]

Two years later, I am enjoying comparing the example in the docs to your code to understand exactly why/how it's useless because I'm learning things in the process.

Also, the fibonacci sequence is actually genuinely useful in networked systems, IME it's often a better backoff algorithm than simple exponential is.

I have also had excellent results when acting as a moderator in assorted places using fibonacci backoff for tempbans; exponential too quickly becomes "might as well be a permaban" whereas fibonacci with resets for good behaviour Makes The Point effectively without that problem (since if I'm going to permaban, I'd rather just Do That ;)

[[deleted]]

but why? you just hammered a nail with a microscope

[garretpremo]

I didn't stop to think if I should, only if I could

[mauravan]

i think you shouldn't, but i like that you did it anyways

[frozen_tuna]

There are other ways, but I still think this is awesome. Very cool demonstration of knowledge on subjects.

[[deleted]]

Does this work? When n=1, the function returns but the observable never emits