Day 2 meeting notes

Brendan Eich brendan at
Fri Jul 30 14:48:10 PDT 2010

On Jul 30, 2010, at 2:37 PM, Brendan Eich wrote:

> For Harmony, we do not propose to standardize |for each|. Instead, the iteration and array comprehensions proposals for Harmony (see the wiki) propose that programmers choose keys, values, items (properties), or other iteration protocols by saying what they mean more precisely on the right-hand side of 'in':
> for (k in keys(o)) ...
> for (v in values(o)) ...
> for ([k, v] in properties(o)) ... // Python's "items"
> This seems better in TC39 members' views than adding ambiguous 'each' as a contextual keyword.

In case it's unclear, these keys, values, etc. iterator factories are "just functions". Of course their names would not be reserved identifiers, and they wouldn't be global functions. The reader should assume they've been imported from a standard module.


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