Hi,
I'm fairly new to clojure as well, but I like this way, and I *think* it's
idiomatic:
Data structure:
[{:zone-max 100 :zone-key :hr-zone-1}
{:zone-max 120 :zone-key :hr-zone-2}
{:zone-max 140 :zone-key :hr-zone-3}
{:zone-max 160 :zone-key :hr-zone-4}
{:zone-max 333 :zone-key :hr-zone-5}]
And function:
(defn hr-zone
"Return the HR zone as a keyword according to the bpm value"[bpm zones]
(:zone-key (first (filter #(<= bpm (:zone-max %)) (sort-by :zone-max
zones)))))
That's just over my parentheses-parsing comfort level, so I'd probably
thread it for readability:
(defn hr-zone
"Return the HR zone as a keyword according to the bpm value"[bpm zones] (->>
zones
(sort-by :zone-max)
(filter #(<= bpm (:zone-max %)))
(first)
(:zone-key)))
This returns nil if given a bpm higher than the defined zones, and it
considers negative heart rates to be in zone one, so you might want to
handle the boundaries differently.
Happy coding,
Johanna
On Monday, February 17, 2014 6:00:40 AM UTC-8, Laurent Droin wrote:
>
> Wow, thanks Gianluco, Andy and Bruno. Lots of good feedback I am trying to
> process. It's amazing how coming up with a satisfying "functional
> programing" style function is a complex process when you've been doing
> imperative programing all your life. It's really a whole different way of
> thinking. I like it but it will take some practice and your feedback really
> helps. It looks like I'm going to spend more time on it. I'll update.
>
>
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