# note that 'not' works as an implementation of 'falsey?' (map not [ nil false true 0 1 'a :a "a" [] {} (fn []) ]) # => @[ true true false false false false false false false false false ] (map truthy? [ nil false true 0 1 'a :a "a" [] {} (fn []) ]) # => @[ false false true true true true true true true true true ]