RESOLVED DUPLICATE of bug 232723 232724
Array.prototype.toLocaleString does not stringify undefined/null localization results 
https://bugs.webkit.org/show_bug.cgi?id=232724
Summary Array.prototype.toLocaleString does not stringify undefined/null localization...
Richard Gibson
Reported 2021-11-04 13:24:51 PDT
The algorithm at https://tc39.es/ecma402/#sup-array.prototype.tolocalestring requires looking up a "toLocaleString" property on each non-undefined non-null element of the receiver array, invoking it as a method, and (absent an exception) passing the result through ToString. However, JSC appears to bypass ToString for undefined or null output from the toLocaleString method. The following expression should evaluate to "undefined", but instead evaluates to "": [{toLocaleString(){}}].toLocaleString() The following expression should evaluate to "null", but instead evaluates to "": [{toLocaleString(){return null}}].toLocaleString() Also reported to test262 for coverage: https://github.com/tc39/test262/issues/3298
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Radar WebKit Bug Importer
Comment 1 2021-11-11 12:25:22 PST
<rdar://problem/85310544>
Yusuke Suzuki
Comment 2 2022-01-03 07:19:01 PST
Will do it in bug 232723 :D *** This bug has been marked as a duplicate of bug 232723 ***
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