SymbolA Symbol value is a unique, non-enumerable primitive value used for encapsulation or information hiding. For example, a symbol can be a key of an object that can never collide with any other key.primitive-typesPrimitive typeswidely2015-09-302018-03-30https://tc39.es/ecma262/multipage/fundamental-objects.html#sec-symbol-objectshttps://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symboljavascript.builtins.Array.@@speciesjavascript.builtins.Symboljavascript.builtins.Symbol.@@toPrimitivejavascript.builtins.Symbol.Symboljavascript.builtins.Symbol.descriptionjavascript.builtins.Symbol.forjavascript.builtins.Symbol.hasInstancejavascript.builtins.Symbol.isConcatSpreadablejavascript.builtins.Symbol.iteratorjavascript.builtins.Symbol.keyForjavascript.builtins.Symbol.matchjavascript.builtins.Symbol.matchAlljavascript.builtins.Symbol.replacejavascript.builtins.Symbol.searchjavascript.builtins.Symbol.speciesjavascript.builtins.Symbol.splitjavascript.builtins.Symbol.toPrimitivejavascript.builtins.Symbol.toStringjavascript.builtins.Symbol.toStringTagjavascript.builtins.Symbol.toStringTag.dom_objectsjavascript.builtins.Symbol.valueOfhttps://nowyoucanuse.com/features--symbol.html