检查JavaScript对象是否为Map或Set(ECMAScript 2015)

Question

什么是检查JavaScript对象是Map还是Set的替代/更好方法:

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

Answer 1

用途instanceof:

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