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?

Bergi · Accepted Answer · 2013-11-03 23:42:52Z

18

This should do it:

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

answered Nov 3, 2013 at 23:42

Bergi

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1 Comment

Abdul Over a year ago

Awesome, it works!, never thought it would be possible with the chain of functions like you suggested. Thanks!

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