On Sun, Sep 1, 2013 at 2:43 AM, Brendan Eich <[email protected]> wrote:
> Lots of constructors/factories out there. An essential (see Aristotle) > argument for why function* for generator syntax (ignoring trumping reasons > 1&2) must say why *this* particular factory needs special (a la function*) > head syntax. > > For all non-generator functions, one important assumption for reading them holds: they always start with the first instruction, and any (potential) deviations from linear control flow are visible exactly where they (might) happen. Not so for generators: to understand what invoking a generator might do, you have to look at all the potential entry points, i.e., all instructions following a yield in the control flow. If you want to do more localized reasoning and are interested in a specific invocation, you also have to reason about which might be the relevant one. Granted, that is essentially state and any function's control flow can be state-dependent, so this point might be less important. Still, having to look at an unknown number of entry points to understand how control flows through a piece of code seems like something you'll want to know about. Without searching the code for "yield".
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