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300Re: return [expression] -> "unable to continue"

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  • Douglas Crockford
    Oct 30, 2008
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      --- In jslint_com@yahoogroups.com, "crlender" <crlender@...> wrote:
      > The following example causes the JSLint parser to fail:

      I think by "fail" you meant that it succeeded in finding the weakness
      in your code.

      > return cache = calculate();

      > Using extra parentheses works:
      > return (cache = calculate());
      > Since parens are not required here (ECMA-262, ed3, 12.9), and JSLint
      > normally complains about extra parens, I wanted to ask if that's on
      > purpose or a bug?

      This is explained in the documentation. When = is used in an
      expression, there is a high likelihood that it is an error caused by
      mistyping == or ===. From a careful reading of your code, I can't be
      sure if your code is in error or not. That is not good. You want your
      code to be more clearly correct. By wrapping the assignment in parens,
      you are demonstrating that you are doing this deliberately.

      I recommend avoiding assignment in expressions. I think

      cache = calculate();
      return cache;

      is cleaner and more bug resistant.
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