JavaScript: Symbol.prototype

New in JS2015.

Symbol.prototype is the value of the property key "prototype" of the function Symbol.

[see Symbol Object]

console.log( Symbol.hasOwnProperty ( "prototype" ) );

Type

Type of Symbol.prototype is Object .

console.log(typeof Symbol.prototype === "object");

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

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

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

2017-02-10 following is work in progress.

Symbol.prototype.constructor

Symbol.prototype.constructor

The value is the object Symbol.

console.log( 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 ]