[swift-evolution] [Review] SE-0024 "Optional Value Setter `??=`"

[James Campbell]

So what would you guys feel to exposing a subscript method like mentioned,
like so:

dict.subscript("key", default:"value")
dict.[]("key", default:"value")
dict["key", default:"value"]



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On Tue, Feb 16, 2016 at 6:42 PM, Sune Foldager via swift-evolution <
swift-evolution at swift.org> wrote:

> …and I of course meant Ruby when I said Python :p
>
> -Sune
>
> On 16 Feb 2016, at 19:38, Sune Foldager <cyano at me.com> wrote:
>
>
> On 13 Feb 2016, at 06:15, Douglas Gregor via swift-evolution <
> swift-evolution at swift.org> wrote:
>
>
>    - What is your evaluation of the proposal?
>
> I’m -1. My main objection is the same as others have brought up, namely
> that, contrary to ??, it keeps us in “optional land”. That is, a ??= b ~> a
> = a ?? b, so a must be optional.
>
>
>    - Is the problem being addressed significant enough to warrant a
>    change to Swift?
>
> I don’t think so. In Python, where ||= works, I do use that from time to
> time because it’s “idiomatic”, but I don’t really think it’s very obvious
> what it does. In Swift, my programming style is a bit different, and I
> don’t find myself needing it. Especially due to the way it keeps optional
> (which is obviously not an issue in Python).
>
>
>    - Does this proposal fit well with the feel and direction of Swift?
>
> I don’t know, but I don’t think it’s a very important addition and can
> lead to confusion instead.
>
>
>    - How much effort did you put into your review? A glance, a quick
>    reading, or an in-depth study?
>
> Read the responses. Thought about my own use, and looked at some Python
> and Swift code.
>
> -Sune
>
>
>
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