another thought - a really nice thing about if, let, and if-let is
that if you know how to use if and let, if-let just makes sense. You
can't say the same about ->, let, and let-> with the current proposal.
On Fri, Nov 16, 2012 at 7:32 AM, Alex Nixon <a...@swiftkey.net> wrote:
> On 16 November 2012 01:25, Mark Engelberg <mark.engelb...@gmail.com> wrote:
>>
>> On Thu, Nov 15, 2012 at 5:17 PM, Alan Malloy <a...@malloys.org> wrote:
>>>
>>> The primary point of let-> is that you can insert it into an existing ->
>>> pipeline.
>>>
>>
>> That makes sense.
>
> It does - thanks for the clarification.
>
> So is let-> intended to be *never* used outside of ->? If so, can an
> argument be made for enforcing its use within -> to avoid (as far as I'm
> aware) introducing a 'new' (value first, name second, no destructuring
> support) binding syntax into core? Despite it being more verbose, I'd
> rather read (-> 42 (let-> meaning-of-life (inc))) than (let-> 42
> meaning-of-life (inc)).
>
> And on destructuring - the closest I can get with keeping compatibility with
> existing -> forms would be
>
> (-> {:foo 1}
> (let-> {:keys [foo] :as x}
> (assoc x :bar :foo)))
>
> The pro is that you get the power of destructuring. The con is that this
> would be the first occurrence of destructuring from outside of an explicit
> binding form.
> --
> Alex Nixon
>
> Software Engineer | SwiftKey
>
> a...@swiftkey.net | http://www.swiftkey.net/
>
>
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