On Wed, Jan 14, 2009 at 4:26 PM, Jason Wolfe <jawo...@berkeley.edu> wrote:
>
> user> (contains? (ancestors (class [1 2 3])) clojure.lang.ISeq)
> false
Also there's 'isa?':
user=> (isa? (class [1 2 3]) clojure.lang.ISeq)
false
user=> (isa? (class (seq [1 2 3])) clojure.lang.ISeq)
true
And 'instance?':
user=> (instance? clojure.lang.ISeq [1 2 3])
false
user=> (instance? clojure.lang.ISeq (seq [1 2 3]))
true
> But, I agree; the seq/coll distinction can be very confusing at first,
> especially when faced with seemingly contradictory outputs like
>
> user> (= '(1) [1])
> true
>
> user> (= '() [])
> false
Hm. That does seem rather odd. I wonder if that paper defining
'egal' address this kind of issue. I haven't read it yet -- perhaps
the time has come.
> user> {'(1) true}
> {(1) true}
>
> user> (get *1 [1])
> true
>
> user> (hash-map '(1) true)
> {(1) true}
>
> user> (get *1 [1])
> nil
The different map types use different kinds of equality, and not all
of these are even defined for all object types: Hash-maps use hash
functions, sorted-maps use a comparator, and array-maps use =
--Chouser
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