lambda - threading macro -> with anonymous functions

Question

I understand the `-> theading macro in Clojure applies all the provided functions provided to a given argument. However, it doesn't seem to work with anonymous functions. For example:

user> (-> 4 inc inc dec)
5

But:

user> (-> 4 #(+ % 1) #(- % 1) #(+ % 1))

Returns the error:

clojure.lang.Symbol cannot be cast to clojure.lang.IPersistentVector
[Thrown class java.lang.ClassCastException]

If someone knows a way around it would be helpful. Thanks!

question from:https://stackoverflow.com/questions/10740265/threading-macro-with-anonymous-functions

Answer 1

You can have anonymous functions in Clojure macros. You are having problems, because you are missing some parentheses. :) Your example is edited below.

(-> 4 (#(+ % 1)) (#(- % 1)) (#(+ % 1)))