| Summary: | Different output compared with other JS engines | ||
|---|---|---|---|
| Product: | WebKit | Reporter: | sunlili |
| Component: | JavaScriptCore | Assignee: | Nobody <webkit-unassigned> |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | Normal | CC: | ashvayka, sunlili, ysuzuki |
| Priority: | P2 | ||
| Version: | WebKit Local Build | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| See Also: |
https://bugs.webkit.org/show_bug.cgi?id=186991 https://bugs.webkit.org/show_bug.cgi?id=186993 |
||
(In reply to sunlili from comment #0) > However, it should be: > arg 1:get Symbol(Symbol.isConcatSpreadable) > arg 1:get length > 1,2,3 As of r232261, JSC outputs as expected. *** This bug has been marked as a duplicate of bug 184267 *** |
Hello, The following code behaves incorrectly (inconsistent with the standard and other engines). arr0 = [ 1, 2, 3 ]; arr1 = [ 4, 5, 6 ]; handler1 = { get: function (oTarget, sKey) { print('arg ' + '1' + ':get ' + sKey.toString()); if (sKey.toString() == 'Symbol(Symbol.isConcatSpreadable)') { return true; } if (sKey.toString() == 'length') { arr1[0] = { 0: 'a', true: 'b', 2: 'c' }; } if (Number(sKey.toString()) != NaN) { arr0[1] = [ 1, 2, 3 ]; arr0[2] = {}; return false; } return Reflect.get(oTarget, sKey); }, has: function (oTarget, sKey) { print('arg ' + '1' + ':has ' + sKey.toString()); if (Number(sKey.toString()) != NaN) { return [ 1, 2, 3 ]; } return Reflect.has(oTarget, sKey); } }; var proxy1 = new Proxy(arr1, handler1); arr2 = Array.prototype.concat.call(arr0, proxy1); print(arr2); Output is: arg 1:get Symbol(Symbol.isConcatSpreadable) arg 1:get Symbol(Symbol.isConcatSpreadable) arg 1:get length 1,2,3 However, it should be: arg 1:get Symbol(Symbol.isConcatSpreadable) arg 1:get length 1,2,3