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Asked: 2026-06-08T02:03:00+00:00

I have backbone collection of models and would like to retrieve the distinct values

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I have backbone collection of models and would like to retrieve the distinct values of a certain property

If I have loaded data like the following into my collection:

[{brand:'audi',id:'1234'},
{brand:'audi',id:'3456'},
{brand:'bmw',id:'3456'}]

I would now want to get the distinct brands from the collection. The result should be: 

['audi','bmw']

Looking at the Backbone and Underscore API I don’t see anything obvious to achieve this.
My current approach would be to use a library like jslinq

Am I missing anything obvious or does somebody have a better suggestion than jslinq?

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1 Answer

  1. Editorial Team

    You can use pluck and then use uniq (example: http://jsfiddle.net/sCVyN/5/)

    pluck

    A convenient version of what is perhaps the most common use-case for
    map: extracting a list of property values.

    uniq

    Produces a duplicate-free version of the array, using === to test
    object equality. If you know in advance that the array is sorted,
    passing true for isSorted will run a much faster algorithm. If you
    want to compute unique items based on a transformation, pass an
    iterator function.

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