for statement with index and value

[Alexander Jones]

It's called `enumerate` in Python. And it's trivial to implement:

```js
for (let [i, value] of enumerate(someIterable)) {
   // behold...
}
```

On Tuesday, July 14, 2015, Domenic Denicola <d at domenic.me> wrote:

> From: Tingan Ho [mailto:tingan87 at gmail.com <javascript:;>]
>
> > But they aren't clean solutions to a wildly popular problem.
>
> I disagree.
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