On Jul 16, 2008, at 10:26 AM, Mark S. Miller wrote:

On Wed, Jul 16, 2008 at 10:11 AM, Brendan Eich <[EMAIL PROTECTED]> wrote:
And? The doc gives rationales for design decisions. What's the
rationale for leaving Object.extend out?

If the document needs to give rationales for leaving out each thing we did not include, it would be quite a long document.

It's pretty long already, yet it dotes on some issues that are less relevant than Object.extend, as demonstrated by all the Ajax code that uses Object.extend but does without, e.g., Object.getPrototypeOf (or __proto__). Do what you want with the doc, but please don't dismiss particular requests for rationales with general fretting about document length.

The issue of draft ES3.1 adding a great many Object APIs, yet not adding one of the most common APIs from popular Ajax libraries, is legitimate to raise. The answer to my question may not lead to a rationale being added to the document, but there ought to be an answer other than "no" -- or onlookers will rightly suspect that there something is wrong in the reasoning behind the rationales.

What is the argument for adding Object.extend()? A pointer to Resig's message or a prior discussion is an adequate response.


https://bugzilla.mozilla.org/show_bug.cgi?id=433351

The argument for Object.extend is similar to the one for Function.bind. Different use-cases, but common re-implementation in real-world code. Both can be built using ES3, but relieving everyone from having to re-invent and re-download these wheels is one of the main purposes of the standard library.

/be
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