Note:
proteus> (defmacro aif [test then else]
(let [it (first (filter #(not (contains? &env %))
(cons 'it (map #(symbol (str "it-" %))
(iterate inc 1)))))]
`(let [~it ~test] (if ~it ~then ~else))))
#'proteus/aif
proteus> (aif (get {:x {:y 3}} :x)
(aif (get it :y)
[it it-1]
it)
nil)
[{:y 3} 3]
proteus> (let-mutable [x 1]
(aif (get {:x {:y 3}} :x)
(aif (get it :y)
(set! x [it it-1])
(set! x it))
(set! x nil))
x)
CompilerException java.lang.RuntimeException: Unable to resolve symbol:
it-1 in this context, compiling:(NO_SOURCE_PATH:1:1)
proteus>
On Thu, Jul 11, 2013 at 6:16 PM, Zach Tellman <ztell...@gmail.com> wrote:
> There was some discussion a few days ago about how the lack of local
> mutable variables were harming performance, or possibly elegance, I'm not
> sure. Regardless, I fixed it: https://github.com/ztellman/proteus
>
> Enjoy!
>
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--
Ben Wolfson
"Human kind has used its intelligence to vary the flavour of drinks, which
may be sweet, aromatic, fermented or spirit-based. ... Family and social
life also offer numerous other occasions to consume drinks for pleasure."
[Larousse, "Drink" entry]
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