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Accessibility

The following illustrates which statements/methods ignore Symbols and which do not.


var o = {a: 10};
var s = Symbol();
o[s] = 20;

// What ignore symbols:
for (p in o) console.log(o[p]);
console.log(JSON.stringify(o));
console.log(Object.entries(o));
console.log(Object.keys(o));
console.log(Object.values(o));
console.log(Object.getOwnPropertyNames(o));

// What do not ignore symbols:
console.log(s in o);
console.log(o.hasOwnProperty(s));
console.log(Object.getOwnPropertySymbols(o));
console.log(Object.getOwnPropertyDescriptor(o, s));
console.log(Object.getOwnPropertyDescriptors(o));

10 {"a":10} [["a",10],...] ["a"] [10] ["a"] true true [Symbol()] {value: 20, writable: true, enumerable: true, configurable: true} {a: Object, Symbol(): Object}