6 ms·
Is that (#2) defined behaviour, or is it undefined? Because iirc, other languages disallow it for similar reasons.
by Alphasite_ 12y ago
Is that (#2) defined behaviour, or is it undefined? Because iirc, other languages disallow it for similar reasons.
- gsnedders 12y agoAdding properties is undefined in ES5 and I believe defined in ES6. Deleting properties is guaranteed to not break iteration and deleting an as-of-yet unvisited property causes it to never be visited.