`String.prototype.symbolAt()` (improved `String.prototype.charAt()`)

Allen Wirfs-Brock allen at wirfs-brock.com
Sat Oct 19 10:03:56 PDT 2013


On Oct 18, 2013, at 4:22 PM, André Bargull wrote:

>> On Oct 18, 2013, at 4:01 PM, Allen Wirfs-Brock wrote:
>> 
>> > 
>> > On Oct 18, 2013, at 1:29 PM, Allen Wirfs-Brock wrote:
>> >> 
>> >> Array.from( '𝌆𝌆𝌆'))[1]
>> > 
>> > maybe even better:
>> > 
>> > Uint32Array.from( '𝌆𝌆𝌆'))[1]
>> 
>> err...maybe not if you want a string value:
>> 
>> String.fromCodePoint(Uint32Array.from( '𝌆𝌆𝌆')[1])
> 
> That does not seem to be too useful:
> 
> js> String.fromCodePoint(Uint32Array.from("\u{1d306}\u{1d306}\u{1d306}")[1])
> "\u0000"

right, it would need to be

String.fromCodePoint(Uint32Array.from( '𝌆𝌆𝌆', s=>s.codePointAt(0))[1])
> 
> 
> According to http://norbertlindenberg.com/2012/05/ecmascript-supplementary-characters/index.html#String, String.prototype[@@iterator] does not return plain code points, but the String value for the code point.

yes, that's correct and how I have it spec'ed in rev20

Allen
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