Check if a JavaScript object is Map or Set (ECMAScript 2015)

Question

What are alternative / better ways to check if a JavaScript object is Map or Set than:

Object.getPrototypeOf(map) === Map.prototype
Object.getPrototypeOf(set) === Set.prototype

Answer 1

Use instanceof:

var foo = new Set;
foo instanceof Set; // True!
foo instanceof Map; // False!