I was asking because my timings show that the lazy version is the
fastest one.
My (very simple & stupid) test is:
(defn flatten-maps
"The original one"
....)
(defn flatten-maps-lazy
"The lazy one"
....)
(defn flatten-maps-eager
"The eager one"
....)
(defn flatten-maps-recur
"Using recur"
....)
And data is:
(def data [{:a 1 :b 1 :c [{:a 2 :b 2 :c [{:a 3 :b 3 :c []}]} {:a 4 :b
4 :c []}]} {:a 5 :b 5 :c [{:a 6 :b 6 :c [{:a 7 :b 7 :c []}]} {:a 8 :b
8 :c []}]}])
That is, the original data but with different numbers to check if the
result is ok:
(time (flatten-maps data))
user=> "Elapsed time: 0.14 msecs"
({:a 5, :b 5} {:a 1, :b 1} {:a 4, :b 4} {:a 2, :b 2} {:a 3, :b 3} {:a
8, :b 8} {:a 6, :b 6} {:a 7, :b 7})
(time (flatten-maps-lazy data))
user=> "Elapsed time: 0.034 msecs"
({:a 1, :b 1} {:a 2, :b 2} {:a 3, :b 3} {:a 4, :b 4} {:a 5, :b 5} {:a
6, :b 6} {:a 7, :b 7} {:a 8, :b 8})
(time (flatten-maps-eager data))
user=> "Elapsed time: 0.129 msecs"
[{:a 1, :b 1} {:a 2, :b 2} {:a 3, :b 3} {:a 4, :b 4} {:a 5, :b 5} {:a
6, :b 6} {:a 7, :b 7} {:a 8, :b 8}]
(time (flatten-maps-recur data))
user=> "Elapsed time: 0.129 msecs"
({:a 8, :b 8} {:a 7, :b 7} {:a 6, :b 6} {:a 5, :b 5} {:a 4, :b 4} {:a
3, :b 3} {:a 2, :b 2} {:a 1, :b 1})
So my tests show that the fastest is the lazy one.
Regards,
Juan Manuel
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