Hello,

I've been investigating the basic data structures and their underlying
concepts in Clojure, particularly focusing on the definitions of coll, seq,
map, vector, set, etc. and their inclusion relationships.

I saw a Venn diagram in this page[1]. Although it is as of Clojure 1.3, I
confirmed it is still correct. "Counted" interface has its only method
count() and it implies that we can get the explicit size of a "Counted"
collection.

However, IPersistentCollection, which is actually the definition of
collections, also has count() method. It's a bit surprising to me that even
LazySeq supports count() (indirectly via ISeq).

Questions:
If IPersistentCollection has count() method, What is "Counted" for?
Is it always reasonable for LazySeq to support count() method? Shouldn't
there be an explicit "CountedLazySeq",

Thanks.
Keisuke

[1] http://www.brainonfire.net/files/seqs-and-colls/main.html


-- 
FUKUDA, Keisuke <福田圭祐>
Tokyo, Japan
Email: keisukefuk...@gmail.com

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