What if there's some computation in there, but such that should be
performed at compile time? I still prefer the outside let whenever I want
to make dead sure it's not getting reallocated on each call. If there was
some well-specified and easily understood guarantee (for example, like the
one Java has for compile-time constants), only then I would prefer the
inner let.
On Friday, March 22, 2013 8:05:10 PM UTC+1, Laurent PETIT wrote:
>
>
> 2013/3/22 jamieorc <jami...@gmail.com <javascript:>>
>
>> Curious which style is preferred in Clojure and why:
>>
>> (defn f1 []
>> (let [x {:foo 1 :bar 2 :baz 3}]
>> (keys x)))
>>
>> (let [x {:foo 1 :bar 2 :baz 3}]
>> (defn f2 []
>> (keys x)))
>>
>
> In either case, AFAIK, the compiler will recognize {:foo 1 :bar 2 :baz 3}
> as constant and will only create it once when compiling.
>
> First version is preferred.
>
>
>>
>> Cheers,
>>
>> Jamie
>>
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