mapper?

tests whether the provided forms support association

If all forms evaluate to mapper values, then this function will return #t (true). A mapper supports keyed lookup and association operations such as assoc and dissoc.

An Example

(mapper? {:name "bill"} #{:name :age} [1 2 3])

This example will return #f (false) because sets and vectors are not mappers.

Like most predicates, this function can also be negated by prepending the ! character. This means that all the provided forms must not be mappers.

(!mapper? #{:name :age} [1 2 3])

This example will return #t (true).