On Sep 5, 2013, at 1:06 , Mathias Bynens <[email protected]> wrote:
> On 26 Aug 2013, at 04:08, Norbert Lindenberg
> <[email protected]> wrote:
>
>> On Aug 24, 2013, at 23:43 , Mathias Bynens <[email protected]> wrote:
>>
>>> I would suggest adding something like `String.isIdentifier` which accepts a
>>> multi-symbol string or an array of code points to the strawman. Seems
>>> useful to be able to do `String.isIdentifier('foobar')`
>>
>> What would be the use case(s) for that?
>
> Tools like http://mothereff.in/js-escapes.
I see nothing on that page about identifiers.
>> Would it accept only an actual identifier or all possible escaped forms of
>> one (i.e., only "𠮷野家" or also "\u{20BB7}野\u5BB6")?
>
> Both, since `"𠮷野家" === "\u{20BB7}野\u5BB6"`. That string is also equal to
> `"\uD842\uDFB7\u91CE\u5BB6"` although it hasn’t been decided if that should
> be a valid identifier too (since it uses the surrogate code points
> explicitly): <https://bugs.ecmascript.org/show_bug.cgi?id=469>. That
> complicates things.
The question is about the purpose of the function: Should isIdentifier just
help with character classification, or with parsing and unescaping as well?
Without real use cases, we can't decide. Note that String methods in general
don't know anything about Unicode escapes - those are handled by the ECMAScript
or JSON parsers.
Norbert
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