JavaScript get elements from an object array that are not in another

Question

I\'m new in JavaScript programming and I have two object arrays that have the following structure:

myFirstObjArray = [{foo: 1, bar: 1}, {foo: 3, bar: 3}, {fo         


        

Answer 1

You could filter by look up.

const unique = a => o => !a.some(({ foo }) => o.foo === foo);

var first = [{foo: 1, bar: 1}, {foo: 3, bar: 3}, {foo: 4, bar: 5}],
    second = [{foo: 2}, {foo: 4}, {foo: 5}],
    uniqueFirst = first.filter(unique(second)),
    uniqueSecond = second.filter(unique(first));
    
console.log(uniqueFirst);
console.log(uniqueSecond);

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