Comment #4 on issue 3822 by impinball: Optimize functions with for-of
https://code.google.com/p/v8/issues/detail?id=3822
Nit: the example using for-of is buggy. It should be this in order to be
equivalent to the first:
```js
function sum(y) {
let sum = 0;
for (let x of y)
sum += x;
return sum;
}
```
Although it should be possible to generate faster bytecode from the onset
with this, particularly with native Arrays, Maps, and Sets (as for-each
loops in Java compile to faster bytecode than the index-based equivalent,
even in statically sized arrays).
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