JavaScript 1.7, the version used in Firefox 2.0, has a raft of Python-inspired features, including generators and list comprehensions. So now, you can do things like:

function fib() {
  var i = 0, j = 1;
  while (true) {
    yield i;
    [i, j] = [j, i + j];
  }
}

and

var evens = [i for (i in range(0, 21)) if (i % 2 == 0)];

And, indeed, bulk assignments, like:

[a, b] = [b, a];

That is, as long as you're not concerned about your code working on non-Mozilla web browsers. (I wonder whether Microsoft, who still have well over 80% of the browser market, will adopt these new features.)

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