Symbol.prototype[Symbol.toPrimitive]
The [Symbol.toPrimitive]() method converts a Symbol object to
a primitive value.
Syntax
Symbol()[Symbol.toPrimitive](hint)
Return value
The primitive value of the specified Symbol object.
Description
The [Symbol.toPrimitive]() method of Symbol returns the primitive
value of a Symbol object as a Symbol data type. The hint
argument is not used.
JavaScript calls the [Symbol.toPrimitive]() method to convert an object to a
primitive value. You rarely need to invoke the [Symbol.toPrimitive]() method
yourself; JavaScript automatically invokes it when encountering an object where a
primitive value is expected.