Swift style syntax

[Mohsen Azimi]

Is it possible to extend JavaScript syntax to support Swift style block
syntax[1]?

In Swift it's possible to omit return keyword
```

   1. reversed = names.sort( { s1, s2 in s1 > s2 } )

```

or omit argument declaration like this:

```

   1. reversed = names.sort( { $0 > $1 } )

```

or apply an operator to arguments of a function

```

   1. reversed = names.sort(>)

```
We have the first feature in ES2015 already:

```
let sorted = names.sort((a, b)=> a > b);
```

But for omitting argument declaration we need to find an alternative to $0,
$1... since those are valid variable names in JS. Maybe we can use #0,
#1... instead.

This is very useful for functional programming aspect of JS. For example in
a filter function:

```
let passed = objs.filter(#0.passed)
```




[1][
https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Closures.html
]
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