Jeff Mad <jeff...@gmail.com> writes:
Hi Jeff,
> I was surprised to find out in the REPL that every? returns true if
> you pass in an empty or nil collection.
>
> user=> (every? #(= 77 %) nil)
> true
>
> user=> (every? #(= 77 %) '())
> true
That's correct. Every item in an empty collection satisfies the
predicate or can you name a counter-example?
Basically,
(every? pred? coll)
is equivalent to
(and (pred? (nth coll 0))
(pred? (nth coll 1))
(pred? (nth coll 2))
...)
The special case of coll being empty is then equivalent to (and) which
is also true.
Bye,
Tassilo
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