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Fully lazy interleave. #13

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Fully lazy interleave. #13

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6 changes: 4 additions & 2 deletions src/lsr/las3r.core.lsr
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Original file line number Diff line number Diff line change
Expand Up @@ -1485,8 +1485,10 @@
"Returns a lazy seq of the first item in each coll, then the second
etc."
[& colls]
(apply concat (apply map list colls)))

(let [fc (first colls)]
(when (seq fc)
(lazy-cons (first fc)
(apply interleave (concat (rest colls) [(rest fc)]))))))

(defn nthrest
"Returns the nth rest of coll, (seq coll) when n is 0."
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