illegalargumentexception-parameter-declaration-should-be-a-vector.md

IllegalArgumentException Parameter declaration should be a vector

Description

Function declaration is missing arguments vector.

Cause

When you declare a new function with documentation strings, it is easy to forget argument vector, especially if function documentation isn't small. Here is an example:

(defn my-static-adder
  "This is my-static-adder function which will simply add
two built-in numbers. Nothing spectacular, just to demonstrate
how easy is to miss argument vector."
  (+ 1 2))

After you evaluate it, you can get this:

IllegalArgumentException Parameter declaration "+" should be a vector  clojure.core/assert-valid-fdecl (core.clj:7196)

Solution

Add argument vector.

(defn my-static-adder
  "This is my-static-adder function which will simply add
two built-in numbers. Nothing spectacular, just to demonstrate
how easy is to miss argument vector."
  []
  (+ 1 2))