JS: Number.prototype

What is Number.prototype

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

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

Type

Type of Number.prototype is Object .

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

Number.prototype is actually a number. It has a value of 0.

console.assert(Reflect.apply(Object.prototype.toString, Number.prototype, []) === "[object Number]");

console.assert(Reflect.apply(Number.prototype.valueOf, Number.prototype, []) === 0);

Parent

Parent of Number.prototype is Object.prototype .

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

Purpose

Purpose of Number.prototype is to provide methods and properties useful for all number objects.

Properties

Convert to string

• JS: Number.prototype.toFixed
• JS: Number.prototype.toPrecision
• JS: Number.prototype.toExponential
• JS: Number.prototype.toString (Number to String)
• JS: Number.prototype.toLocaleString

Other

Number.prototype.constructor

Value is Number. 〔see Number Object〕

console.assert(Number.prototype.constructor === Number);

Number.prototype.valueOf

Return the number as primitive value.

console.assert((new Number(3)).valueOf() === 3);