Map.prototype[Symbol.toStringTag]
New in JS2015.
Map.prototype [ Symbol.toStringTag ]-
Value is the string
"Map".[see Determine Type of Object]
console.log(Map.prototype[Symbol.toStringTag] === "Map");
New in JS2015.
Map.prototype [ Symbol.toStringTag ]"Map".
[see Determine Type of Object]
console.log(Map.prototype[Symbol.toStringTag] === "Map");