Each binding introduces a new name/value pair, which can shadow
previous name/value pairs.
I sometimes use let to introduce a modified version of a function
argument or sometimes when I'm conditionally building up a value:
(let [params [x y]
params (if some-arg? (conj params z) params)]
...)
Now we're on 1.5.1, I'll probably rewrite code like this to use cond->
(let [params (cond-> [x y]
some-arg? (conj z))]
...)
(once I've convinced myself that is correct!)
Sean
On Tue, Apr 2, 2013 at 12:09 PM, larry google groups
<lawrencecloj...@gmail.com> wrote:
>
> If Clojure is suppose to emphasize immutability, why can I do this:
>
> kiosks-clojure.core=> (let [
> #_=> mega (+ 1 1)
> #_=> mega (+ 1 mega)
> #_=> mega (+ 1 mega)
> #_=> mega (+ 1 mega)
> #_=> mega (+ 1 mega)]
> #_=> mega)
> 6
>
> I might as well be writing PHP code.
>
> Does anyone actually write Clojure code like this, or is it considered bad
> form?
>
>
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--
Sean A Corfield -- (904) 302-SEAN
An Architect's View -- http://corfield.org/
World Singles, LLC. -- http://worldsingles.com/
"Perfection is the enemy of the good."
-- Gustave Flaubert, French realist novelist (1821-1880)
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