On 4 Sep 2013, at 18:34, Brendan Eich <[email protected]> wrote: > Here, from the latest ES6 draft, is 15.5.2.3 String.fromCodePoint ( > ...codePoints): > > The String.fromCodePoint function may be called with a variable number of > arguments which form the > rest parameter codePoints. The following steps are taken: > 1. Assert: codePoints is a well-formed rest parameter object. > 2. Let length be the result of Get(codePoints, "length"). > 3. Let elements be a new List. > 4. Let nextIndex be 0. > 5. Repeat while nextIndex < length > a. Let next be the result of Get(codePoints, ToString(nextIndex)). > b. Let nextCP be ToNumber(next). > c. ReturnIfAbrupt(nextCP). > d. If SameValue(nextCP, ToInteger(nextCP)) is false,then throw a RangeError > exception. > e. If nextCP < 0 or nextCP > 0x10FFFF, then throw a RangeError exception. > f. Append the elements of the UTF-16 Encoding (clause 6) of nextCP to the end > of elements. > g. Let nextIndex be nextIndex + 1. > 6. Return the String value whose elements are, in order, the elements in the > List elements. If length is 0, the > empty string is returned. > > > No exposed surrogates here!
I think what Anne means to say is that `String.fromCodePoint(0xD800)` returns '\uD800` as per that algorithm, which is a lone surrogate (and not a scalar value). _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
