Well-known symbols are built-in Symbol values that are explicitly referenced by algorithms of this specification. They are typically used as the keys of properties whose values serve as extension points of a specification algorithm. Unless otherwise specified, well-known symbols values are shared by all realms (
Within this specification a well-known symbol is referred to by using a notation of the form @@name, where “name” is one of the values listed in
|Specification Name||[[Description]]||Value and Purpose|
The abstract operation EvaluateSliceNotation takes as arguments a baseValue (an ECMAScript langauge value), startExpression (a
With parameters baseValue and baseReference.