Return value of forEach

[Niloy Mondal]

Currently, `Array.prototype.forEach` returns `undefined`. It would be more
useful if it returns the array itself.

Say I have written some code like this...

```js
const a = [1, 2, 3]
  .map(square)
  .map(plus1)
  .reduce(add);
```

For some reason, I am not getting the expected output. For debugging, I
would
like the print the values after each step. My first initial reaction is to
put a `forEach` step in between and print the values like so...

```js
const a = [1, 2, 3]
  .map(square)
  .forEach(x => console.log(x))
  .map(plus1)
  .reduce(add);
```

Unfortunately, this does not work as `forEach` returns `undefined`. I now
have
to comment out all the code below it. Having the _plug and play_ behaviour
for
`forEach` would be very convenient.
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