Can this function reliably detect the presence of @@toStringTag in all environments?
function hasToStringTagSymbol() {
if (Symbol && (typeof Symbol() == "symbol") && !!Symbol.toStringTag) {
var xTest = function () { };
xTest.prototype[Symbol.toStringTag] = "Test";
xTest = new xTest();
return toString.call(xTest) == "[object Test]";
}
else {
return false;
}
}
This specific snippet of code fails to accurately identify polyfilled Symbol.toStringTag. Although it is feasible to polyfill Symbol and its impact on toString (as demonstrated by core-js), introducing a new primitive type for typeof is not possible. The current implementation does not verify that Symbol is also a function, nor does it require creating a new symbol.
A revised version should look something like this:
if (typeof Symbol !== "undefined" && Symbol && Symbol.toStringTag) {
var obj = {};
obj[Symbol.toStringTag] = "Test";
return toString.call(obj) == "[object Test]";
}
Polyfilling Symbol and its influence on toString can be easily achieved. If a developer is seeking specific JS functionalities in their application, they may want to prioritize those that cannot be polyfilled, particularly in older browsers. This could involve using Object.setPrototypeOf for ES5, leveraging Proxy in ES6, or identifying syntactic features.
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