Close review of Language Overview whitepaper

T. Michael Keesey keesey at
Wed Nov 14 14:44:03 PST 2007

On Nov 14, 2007 2:03 PM, Maciej Stachowiak <mjs at> wrote:
> Nullability: Are non-nullable types really worth it? I am not sure.
> Does any other explicit type system for a dynamic OO language have
> such a concept? The whitepaper says that "the ability to store null is
> occasionally the source of run-time errors" but will not dynamic-
> checking result in runtime errors anyway when assigning null to a non-
> nullable variable (except in strict mode)?

That was one of the features I most liked. Working in Flex, I have
problems with nullable variables all the time.

> Map: Long overdue to have a real hashtable type.

Parameterized types in general are probably my favorite addition. (Now
if only there were some sort of solution comparable to abstract

T. Michael Keesey
Director of Technology
Exopolis, Inc.
2894 Rowena Avenue Ste. B
Los Angeles, California 90039

More information about the Es4-discuss mailing list