how to get unique array based of nested attribute using underscore.js

Question

I have a json array like this :

myArray=[{ a:1,
          b:[{c:"x",d:"y"}, {c:"r", d:"s"}...]
         },
         { a:2,
          b:[c:"p",d:"q"}, {c:"x", d:"s"}...]
         }
         ...
        ]

Is it possible to get a subset of myArray with unique values of "c" using underscore.js?

Answer 1

This should do it:

_.chain(myArray)
 .pluck("b")
 .flatten()
 .pluck("c")
 .unique()
 .value()