Lodash / javascript : Compare two collections and return the differences [duplicate]

Question

I have two arrays of objects:

Elements of my tables are not primitive value, but complex objects.

array1 = [obj1,obj2,obj3,obj4]
array2 = [obj5,obj5,obj6,obj7]

I would like to compare two arrays and see if the elements of array2 are already present in array1 then create a new array of the difference.

Any suggestions?

so this was marked duplicate by 6 people? do those 6 people even know the difference between an array of primitives and an array of complex objects? — Emobe
– Emobe, Commented Mar 13, 2019 at 14:58
I think lodash _.differenceBy(lodash.com/docs/4.17.15#differenceBy) could help. — Shivam Kubde
– Shivam Kubde, Commented Feb 28, 2020 at 4:47

Community · Accepted Answer · 2021-02-24 19:56:19Z

77

var presents = _.intersectionWith(array1, array2, _.isEqual);
var dif = _.differenceWith(array1, array2, _.isEqual);

_.differenceWith is only available since 4.0.0 lodash version

edited Feb 24, 2021 at 19:56

CommunityBot

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answered Nov 17, 2016 at 13:33

stasovlas

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2 Comments

Siva Kannan Over a year ago

_.differenceWith is only available since 4.0.0 lodash version

Justin Meskan Over a year ago

did you see he ask about :::: arrays of objects array1 = [obj1,obj2,obj3,obj4] array2 = [obj5,obj5,obj6,obj7]

Alex Bykov · Accepted Answer · 2016-11-17 13:43:21Z

29

ES6 This will be enough:

array2.filter(e => !array1.includes(e));

without includes

array2.filter(e=> array1.indexOf(e) < 0);

Plunker for you

edited Nov 17, 2016 at 13:43

answered Nov 17, 2016 at 13:31

Alex Bykov

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2 Comments

Nacim Idjakirene Over a year ago

can't use your solution since i'am using angular 2 with typescript, includes return an error

Emobe Over a year ago

this is NOT enough. you are using primitive values in the plunkr, OP is not

Matteo Bombelli · Accepted Answer · 2016-11-17 13:35:26Z

8

_.difference gives you only the elements that are in the 1st array but not in the second one, nothing about the elements on the array 2 that are not in the array 1.

Is this what you want to achieve?

answered Nov 17, 2016 at 13:35

Matteo Bombelli

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3 Comments

Nacim Idjakirene Over a year ago

yes this is what i'am trying to achieve, but when i use _difference in the case that my two array are idantical i have array1 as output ! is it normal ?

Matteo Bombelli Over a year ago

no... should send you [] (I've tested it now on chrome console in lodash docs...). are you using nodejs or a web browser?

Nacim Idjakirene Over a year ago

yeah finally it works fine, it was an error made by me . thx for your help

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