JS: Boolean.prototype

By Xah Lee. Date: 2017-03-13. Last updated: 2024-04-09.

What is Boolean.prototype

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

Boolean.hasOwnProperty ( "prototype" )

Type of Boolean.prototype is Object .

typeof Boolean.prototype === "object"

Boolean.prototype is a boolean object.

Reflect.apply ( Object.prototype.toString, Boolean.prototype , [] ) === "[object Boolean]"

Reflect.apply ( Boolean.prototype.valueOf, Boolean.prototype , [] ) === false

Parent of Boolean.prototype is Object.prototype .

Reflect.getPrototypeOf ( Boolean.prototype ) === Object.prototype

Purpose of Boolean.prototype is to hold methods valueOf and toString for converting values to true or false, or a string form.

Boolean.prototype.constructor

Value is Boolean.

Boolean.prototype.constructor === Boolean

true.constructor === Boolean

Boolean.prototype.valueOf()

Convert boolean object to primitive boolean.

true.valueOf () === true

false.valueOf () === false

Boolean.prototype.toString()

Convert boolean to string "true" or "false".

true.toString () === "true"

false.toString () === "false"