On Tue, Nov 8, 2011 at 12:49 PM, Brendan Eich <bren...@mozilla.com> wrote:
> The recommended practice when writing for-in loops in JS today is to write:
> for (i in o) {
> if (o.hasOwnProperty(i)) {
> body
> }
> }
> Although many JS developers do not follow the recommendation (out of
> ignorance or intentionally, doesn't matter).
> Should ES.next provide sugar for the recommended pattern? To make it compose
> with declarations and destructuring in the for head, it should use a
> contextual keyword immediately after 'for':
> for own (i in o) {
> body
> }
> This is a small thing but it might pay off in the long run.
Just as a point of comparison, I use this form:
Object.keys(o).forEach( function(key) {
body
});
I would use |for own| if it existed, solely to avoid thinking about
overhead and because single stepping would work better.
jjb
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