Re: The "->" & "." nested usage

[Stephen C. Gilardi]

On Jun 8, 2009, at 12:38 PM, ronen wrote:

user=> (-> String. String.)
java.lang.ClassNotFoundException: String. (NO_SOURCE_FILE:7)

expanding the macros involved seems to reveal the issue:

user=> (macroexpand-1 `(-> String. String.))
(java.lang.String. java.lang.String.)

the "." macro isn't expanded.

(String.)

creates a String object.



Here's an example of -> in action:



--Steve

The trailing dot syntax is used for creating an object given a class name: Nested macros work fine. What were you hoping the above expressions would expand to? (-> (System/getProperties) (.get "java.class.path") .toUpperCase (nth 3) int (* 2))

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