Using a map instead of if means that it is evaluated as a function call.
Unlike the if form, function calls eval their arguments. So the (recur)
form is getting eval'd prior to being passed to the map/function, which
isn't a tail position.
That's why "if" is a special form/macro, not a regular function (like maps
are).
On Friday, April 27, 2012 10:52:10 AM UTC-4, Dominikus wrote:
>
> Sure? The semantics of the default value corresponds to a 'if', doesn't
> it? From this viewpoint, the default value is in tail position. And why
> does the non-tailrecursive version not run as expected?
>
> Dominikus
>
>
> Am Freitag, 27. April 2012 16:45:44 UTC+2 schrieb Meikel Brandmeyer
> (kotarak):
>>
>> Hi,
>>
>> (defn fix2 [f x] (let [v (f x)] ({x x} v (recur f v))))
>>
>> recur is not in the tail position. The "call" to the map is the tail
>> call. So the result is as expected.
>>
>> Kind regards,
>> Meikel
>>
>>
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