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Re: [jslint] for comma

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  • Douglas Crockford
    ... It looks rather stupid. The initialization of the induction variable should be in the control part of the for.
    Message 1 of 33 , Jul 15, 2011
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      --- In jslint_com@yahoogroups.com, Erik Eckhardt <erik@...> wrote:
      >
      > It is possible to avoid using the comma. Is this any better?
      >
      > (function () {
      > "use strict";
      > var arr = [], i = 0, len = arr.length;
      > // Populate arr
      > for ( ; i < len; i += 1) {
      > // Do something
      > }
      > }());
      >
      > I removed the first section of the `for` statement entirely to emphasize how
      > `i` and `len` probably should be initialized together.


      It looks rather stupid. The initialization of the induction variable should be in the control part of the for.
    • Douglas Crockford
      ... So how do you design a programming style? What justification is there for preferring one feature over another? One school says that Just Cuz is an
      Message 33 of 33 , Jul 21, 2011
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        > > Can you come up with an example where
        > > their use makes code clearer?
        >
        > Why is that "the real question"?
        >
        > Computer languages are tools. The tools are flexible and varied.
        > Absent a very clear harm, we should not remove flexibility.

        So how do you design a programming style? What justification is there for preferring one feature over another? One school says that "Just Cuz" is an adequate criteria. It just comes down to personal taste. And even though we know it isn't true, we are all free to believe that one person's taste is as good as anyone else's.

        My approach is different. I am trying to have mechanical identification of defects. There are some situations that are difficult to distinguish mechanically, so I now consider all of those cases problematic, even when they are not obviously wrong.

        I believe strongly in subsetting, and my design of subsets factors in things like mechanical identification.

        There are certainly tradeoffs here. I am rejecting some features. But I think this is a minimal cost because those features are not essential. We can still write very good programs without them. The benefit is that we can mechanically detect more defects. An unexpected but significant benefit is that the subset is itself a better language than the whole language, and the programs written in that subset tend to communicate better to other humans.
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