JS: Symbol.prototype

What is Symbol.prototype

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

Symbol.hasOwnProperty("prototype")

Type

Type of Symbol.prototype is Object .

typeof Symbol.prototype === "object"

Parent

Parent of Symbol.prototype is Object.prototype .

// parent of Symbol.prototype
console.log(Reflect.getPrototypeOf(Symbol.prototype) === Object.prototype);

Purpose

Symbol.prototype is the parent of all symbol objects.

let ss = Symbol();

console.log(
  Reflect.getPrototypeOf(Object(ss)) === Symbol.prototype,
);

// Object(ss) converts symbol primitive ss to a symbol object

〔see Prototype and Inheritance〕

Properties

• Symbol.prototype.constructor
• Symbol.prototype.description
• Symbol.prototype.toString
• Symbol.prototype.valueOf
• Symbol.prototype[Symbol.toPrimitive]
• Symbol.prototype[Symbol.toStringTag]

2017-02-10 following is work in progress.

Symbol.prototype.constructor

Symbol.prototype.constructor

The value is the object Symbol.

Symbol.prototype.constructor === Symbol

Symbol.prototype.description

Return the description of the symbol.

Symbol.prototype.toString( )

return a string of the form:

"Symbol(description)"

const x = Symbol("xyz");
console.log(x.toString() === "Symbol(xyz)");

Symbol.prototype.valueOf ( )

Symbol.prototype [ Symbol.toPrimitive ] ( hint )

Symbol.prototype [ Symbol.toStringTag ]