What is the difference between the functions seq?, sequential? and coll?

Question

What is the difference between the functions seq? sequential? and coll?

I found some information scattered throughout the internet, but I think it would be better to

Answer 1

• seq? is true for any sequence.
• sequential? is true for any sequential (not associative) collection.
• coll? is true for any Clojure collection.

seq? implies sequential? implies coll?

=> ((juxt seq? sequential? coll?) ()) ; [true true true]
=> ((juxt seq? sequential? coll?) []) ; [false true true]
=> ((juxt seq? sequential? coll?) #{}); [false false true]

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Inaccurate: sequential? is related to the others purely by convention - see Kevin's answer.