@@toStringTag

[zloirock]

@@toStringTag definitely should be added to all instances from this proposal.

[domenic]

Nope. New things (like Map, Set, Promise, user-defined classes ... and Observable) don't get toStringTag. It's a legacy language feature added to preserve back-compat.

[zloirock]

Nope. New things (like Map, Set, Promise, user-defined classes ... and Observable) don't get toStringTag.

Seriously? :)

Map.prototype[Symbol.toStringTag]; // => "Map"
Object.getPrototypeOf(new Map().values())[Symbol.toStringTag]; // => "Map Iterator"
Promise.prototype[Symbol.toStringTag]; // => "Promise"
SIMD.Float32x4.prototype[Symbol.toStringTag]; // => "SIMD.Float32x4"

[domenic]

You're right, I was confusing this with another toString-related spec thing. Apologies.

[benjamingr]

Looks like it's defined for everything separately, http://www.ecma-international.org/ecma-262/6.0/#sec-promise.prototype-@@tostringtag I was thinking species :D

[jhusain]

Certainly seems like this should be done. Will try and get around to this prior to the next meeting.