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Improve isEnumerable check with a for-in loop for string names (#880)
Ref https://github.com/tc39/test262/pull/879#discussion_r104128520
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@ -11,7 +11,22 @@ function isConfigurable(obj, name) {
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}
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function isEnumerable(obj, name) {
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return Object.prototype.hasOwnProperty.call(obj, name) &&
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var stringCheck;
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if (typeof name === "string") {
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for (var x in obj) {
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if (x === name) {
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stringCheck = true;
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break;
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}
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}
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} else {
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// skip it if name is not string, works for Symbol names.
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stringCheck = true;
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}
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return stringCheck &&
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Object.prototype.hasOwnProperty.call(obj, name) &&
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Object.prototype.propertyIsEnumerable.call(obj, name);
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}
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