Edward Tsech <edts...@gmail.com> writes:
> java.lang.IllegalArgumentExcepdtion: if-let requires exactly 2 forms
> in binding vector(NO_SOURCE_FILE:1)
>
> Why doesn't "if-let" support any even amount of binding forms as "let"
> does?
>
> e.g.
> (if-let [x 1 y 2 z 3]
> (+ x y z)
> 0) ; => 6
>
> (if-let [x 1 y nil z 3]
> (+ x y z)
> 0) ; => 0
At least in my experience, it usually matters a lot which form actually
evaluated to nil. But it's easy to write a macro `if-let-all' or so,
which would expand into
(let [x 1 y nil z 3]
(if (and x y z)
(+ x y z)
0))
if you really feel a need for it.
Bye,
Tassilo
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