Difference between two arrays of objects coffeescript using underscore js

Question

I am trying to find the difference betweeen two arrays of objects using underscore js library.

underscore in coffeescript, every sain developers nightmare, so I guess simple plain old javascript, like this one is out ? — adeneo
– adeneo, Commented Jul 25, 2014 at 21:00

Gabriel · Accepted Answer · 2014-07-25 22:08:21Z

13

Do you want to use the difference function of underscore? You can do this:

_.difference([1, 2, 3, 4, 5], [5, 2, 10])

this works in coffeescript.

EDIT

Using an array of objects and comparing the id property

arrayOne = [{id: 1}, {id: 2}]
arrayTwo =[{id: 2}, {id: 3}]

_.select arrayOne, (item) ->
    !_.findWhere(arrayTwo, {id: item.id})

edited Jul 25, 2014 at 22:08

answered Jul 25, 2014 at 21:58

Gabriel

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3 Comments

compsci45000 Over a year ago

ya thats what i want to do but i want to do it for two arrays of objects not integers. Each object has a unique integer ID

Michael Oryl Over a year ago

Just beware: the order of the arrays matters when using _.difference(). It doesn't show you the items that don't belong to both, it shows you what you have left when you subtract the second array from the first.

EuAndreh Over a year ago

Awesome elegant solution. UnderscoreJS really rocks =]

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