Array pattern destructuring not actually supported?

[ninegrid]

When demonstrating generators:

function* fibonacci() {
  let a = 0, b = 1;

  while(true) {
    yield a;
    // this syntax doesnt appear to be actually supported
    [a, b] = [b, a + b];
  }
}

ReferenceError: Invalid left-hand side in assignment

I'm using node v0.11.13 with the --harmony flag.

[ninegrid]

Sorry, I took another look at the document and saw at the bottom:

"We look forward for tasty syntax sugar yet to come, such as rest and spread operators, destructuring "...

[JustinDrake]

No no, this is good. Thanks for posting. :) All examples should run in the latest Node.

[ninegrid]

No problem then, I've been playing with harmony a lot lately and this resource is excellent. Though this feature is not currently present, it would appear that it is inbound in v8

[ronny-springer]

Hi Justin, there is a mistake in given Fibonacci example. If n is 0 it is 0 (e.g. Ron Knott's Fib table).

I share my code at jsbin.com for ES5

// iterative
function fibonacci (n) {
    var i = 0,
        temp = [i, i + 1];

    for (i = 2; i <= n; i += 1) {        
        temp[i] = temp[i - 1] + temp[i - 2];
    }  

    return (temp[n]);
}

// recursive one liner (very slow if n > 50 ! & bad to read)
function f (n) {
  return ((n >= 2) ? f (n - 1) + f (n - 2) : n);
}

[ninegrid]

@ronny-springer perhaps you should create a seperate issue for that so that it gets noticed. This issue has to do with destructuring syntax in general and not the fibonacci example per se...