my-idlers/node_modules/collect.js/docs/api/diff.md

diff()

The diff method compares the collection against another collection or a plain array based on its values. This method will return the values in the original collection that are not present in the given collection:

const collection = collect([1, 2, 3, 4, 5]);

const diff = collection.diff([1, 2, 3, 9]);

diff.all();

// [4, 5]

View source on GitHub