Lodash / [removed] Compare two collections and ret

问题:

This question already has an answer here:

• How to get the difference between two arrays in Javascript? 60 answers

I have two array of object :

the element of my table are not primitive value, but complexe objects.

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

I would like to compare two arrays and see of the elements of array 2 are already present in array1 then create a new array of the difference.

Any suggestion ?

回答1:

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

回答2:

ES6 This will be enough:

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

without includes

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

Plunker for you

回答3:

_.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?