Rowdy's question asks for less than what core/distinct delivers--he
only wanted to remove *adjacent* duplicates.
That said, core/distinct is a better demo of "how do I maintain state
across a lazy sequence without requiring any mutation?"
Stu
Hi,
On Feb 18, 3:04 pm, Rowdy Rednose <rowdy.redn...@gmx.net> wrote:
"Returns a lazy sequence of the items in coll for which (pred item)
returns true. pred must be free of side-effects."
So that means I should not write a function like this:
(defn unique [sc]
"Returns a lazy sequence with all consecutive duplicates removed"
(let [last (atom (Object.))]
(filter #(let [ok (not= @last %)] (reset! last %) ok) sc)))
user=> (unique [1 2 3 3 4 5 5 6])
(1 2 3 4 5 6)
But in contrast to functions that can be retried (compare-and-swap
etc.), I don't immediately see why having side effects in filter
would
be bad. Can anybody enlighten me? And how should I do this instead?
Besides the other suggestions: clojure.core/distinct and its
implementation.
Sincerely
Meikel
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