Hi, I recently gave a Google tech talk on my joint work with Mark S. Miller on Harmony proxies and the traits.js library. Below is an abstract and a link to the video.
ABSTRACT We discuss two proposed language features for inclusion in ECMAScript-Harmony. The first, dynamic proxies, enables Javascript programmers to create proxy objects that can intercept property access, assignment, enumeration, etc. It is a powerful metaprogramming mechanism that provides a standard API for creating generic wrappers for transparent access control, implementing legacy API adaptors, profilers, lazy initialization, etc. The second part of the talk introduces a traits library for ECMAScript 5. Traits are a more robust alternative to multiple inheritance or mixin-based composition. Based on ECMAScript 5's new "property descriptor" API, we built a portable lightweight library that supports trait-based object composition. We discuss the limitations of introducing traits using a library approach and highlight the benefits of direct support for traits in ECMAScript-Harmony. Video: http://www.youtube.com/watch?v=A1R8KGKkDjU Talk slides: http://es-lab.googlecode.com/files/harmony_highlights_techtalk.pdf traits.js library: www.traitsjs.org Cheers, Tom
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