Andrea Giammarchi wrote:
Is it very useful because you wrote for instead of while ?

```javascript
while (m = re.exec(str))
  console.log(m[0])
;
```

It is, for two reasons:

1. in JS only for can have a let or var binding in the head.

2. the utility extends to all for-of variations: array comprehensions, generator expresisons.

/be
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