On Sep 29, 2011, at 9:03 PM, Sean Eagan wrote:
> On Mon, Sep 26, 2011 at 7:27 PM, Waldemar Horwat <[email protected]> wrote:
>> Reached consensus on the following # proposal:
>> # before an object literal seals the object
>> # before a propoerty makes that property nonconfigurable and nonwritable.
>> All method properties are nonenumerable.
>> All value properties are enumerable.
>
> I like it! Here are some extensions to consider:
>
> # to seal, ## to freeze:
Too much chicken-scratching. It's tempting but I think we should focus on one
funny prefix char per special form and make it count, optimize for the common
case. Uncommon cases use APIs.
> ##{
> p: 1,
> m() {}
> }
>
> # non-configurable, ## non-writable as well:
> {
> #p: 1,
> ##m() {}
> }
These do regularize things from the consensus Waldemar recorded: you need one #
to seal, two to freeze, whether property or object. But the consensus we
reached was aimed at common use-cases. The idea is that sealing an object is
more common than freezing it, while freezing a property is more common than
sealing it.
> Extend to other literal forms ala <|:
>
> #[a, b, c]
> #function(){...}
> #/\d+/
> #1
> #""
> #true
We don't want # as a prefix for value types. I did propose in HoMD that we
support #(a,b){...} but that fell to completion leak concerns and the desire of
some for shorter syntax without freezing/joining (so without # prefix in this
scenario, but (a){} is ambiguous with current JS if you insert a newline
between the ) and the {).
> Compose with <|:
>
> null <| ##{...} // record-esque
> null <| ##[...] // tuple-esque
These are too long if common, they want the HoMD single # prefixing.
> Include tuple-isms for #[], ##[]:
>
> holes => syntax error
> length cannot be greater than 2^32 - 1
Sure, this carries over for all tuple proposals (I assert). But we want shorter
syntax, no doubled funny chars, no verbose regularity at the expense of common
cases being relatively overlong.
/be
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