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Hands-On Reactive Programming with Clojure - Second Edition
book

Hands-On Reactive Programming with Clojure - Second Edition

by Konrad Szydlo, Leonardo Borges
January 2019
Intermediate to advanced content levelIntermediate to advanced
298 pages
7h 46m
English
Packt Publishing
Content preview from Hands-On Reactive Programming with Clojure - Second Edition

Working with the active keys stream

The groundwork we've done so far will make sure that we can easily handle game events in a clean and maintainable way. The main idea behind having a stream representing the game keys is that now we can partition it much like we would a normal list.

For instance, if we're interested in all events where the key being pressed is UP, we would run the following code:

(->> active-keys-stream 
     (r/filter (partial some #{UP})) 
     (r/map (fn [_] (.log js/console "Pressed up...")))) 

Similarly, for events involving the FIRE key, we could do the following:

(->> active-keys-stream 
     (r/filter (partial some #{FIRE})) 
     (r/map (fn [_] (.log js/console "Pressed fire...")))) 

This works because, in Clojure, sets can be used as ...

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Publisher Resources

ISBN: 9781789346138Supplemental Content