Add pattern aliasing to syntax reference

[narkisr]

The ability of using pattern aliasing, ie:

update ({ a } as model) action 
  -- rest of function body

is missing from the syntax docs.

[trotha01]

+1

[ghost]

This seems cool. What are its uses exactly? I've seen it used to update a nested record. I've used let expressions or helper functions to do that.

[narkisr]

You can destruct records/nested DS within the function definition itself

[pdamoc]

It is also used for aliasing modules as in

import Html.Attributes as Attr

[ghost]

I see. The example here is illustrative. So it saves you writing object.x everywhere, you just write x.