JS: Map.prototype

What is Map.prototype

Map.prototype is the value of the property key "prototype" of the function Map. 〔see Map Object〕

console.assert(Object.hasOwn(Map, "prototype"));

Type

Type of Map.prototype is Object .

console.assert(typeof Map.prototype === "object");

Parent

Parent of Map.prototype is Object.prototype .

console.assert(Reflect.getPrototypeOf(Map.prototype) === Object.prototype);

Purpose

Purpose of Map.prototype object is to provide methods and properties useful for all map instances.

Map.prototype is the parent of all map instances.

console.assert(Reflect.getPrototypeOf(new Map()) === Map.prototype);

〔see the Map Object Tutorial〕

Properties

Value Properties

• JS: Map.prototype.constructor
• JS: Map.prototype.size
• JS: Map.prototype[Symbol.toStringTag]

Function Properties

get and set

• JS: Map.prototype.get
• JS: Map.prototype.set
• JS: Map.prototype.has
• JS: Map.prototype.delete
• JS: Map.prototype.clear

iteration

• JS: Map.prototype.forEach
• JS: Map.prototype.entries
• JS: Map.prototype.keys
• JS: Map.prototype.values

• Map.prototype[Symbol.iterator] same as Map.prototype.entries