On 12 June 2012 14:28, Jim - FooBar(); <[email protected]> wrote:
> Of course, I Just noticed that type-hinting 'p' renders the precondition
> useless...an extra performance bonus!
Not really -- only primitive type hints actually prevent the function
from accepting a non-matching argument:
(defn foo [^java.util.Map x] x)
(foo #{})
;= #{}
(defn foo [x]
{:pre [(instance? java.util.Map x)]}
x)
(foo #{})
; AssertionError
M.
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