for own(...) loop (spin-off from Re:, hasOwnProperty(), and inheritance)

Axel Rauschmayer axel at
Wed Nov 9 14:43:15 PST 2011

>> And if you need to break out of forEach, just, umm, don't use forEach. It's the wrong tool for the job.
> Clearly people like the forEach array extra in conjunction with Object.keys. With block-lambdas they could have their cake and break from it too (and the call would be paren-free to boot).


Do block-lamdbas count as a fix for the dynamic this problem? Or are there other plans to get it solved? I would still love to see that happen, it’s a remarkably subtle source of errors. Could functions adopt the block-lambda semantics of picking up the `this` of the surrounding scope when not invoked as methods? It seems like that could work in strict mode where no one expects `this` to have a value.

Dr. Axel Rauschmayer
axel at


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