Compare two Arrays with Objects and create new array with unmatched objects

Question

I have the following two Javascript arrays:

const array1 = [{ id: 1}, { id: 2 }, { id: 3 }, { id: 4}];
const array2 = [{ id: 1}, { id: 3 }];

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Answer 1

You could reverse the comparison (equal instead of unqual) and return the negated result of some.

const
    array1 = [{ id: 1 }, { id: 2 }, { id: 3 }, { id: 4 }],
    array2 = [{ id: 1 }, { id: 3 }],
    array3 = array1.filter(entry1 => !array2.some(entry2 => entry1.id === entry2.id));
    //                               ^                                ^^^

console.log(array3);