Question

I am loading forms from a file using slurp, read, and cons’ing them together to recursively read all forms into a collection. Then wish to pass this into scriptjure’s (js [& forms]) function, which expects a (list?), but (cons) gives me a Cons classed-object. How may I convert (class (cons 1 ‘(2 3 4 5))) to be IPersistentList? Thanks!

Answer 1

Use (apply list x) to create a list from sequence x :

user=> (class (apply list (cons 1 '(2 3 4 5 6))))
clojure.lang.PersistentList

Alternatively, if you start with a list and then conj forms onto it, you’ll end up with a list:

user=> (class (conj (list 1 2 3) 4))
clojure.lang.PersistentList

No need for cons in this case since conj, given a list, returns a list.