How to get the difference between two arrays of objects in JavaScript?

To get the difference between two arrays of objects in JavaScript, we use the filter and some methods.

For instance, we write

const arrayOne = [
  { value: "4a55eff3-1e0d-4a81-9105-3ddd7521d642", display: "Jamsheer" },
  { value: "644838b3-604d-4899-8b78-09e4799f586f", display: "Muhammed" },
  { value: "b6ee537a-375c-45bd-b9d4-4dd84a75041d", display: "Ravi" },
  { value: "e97339e1-939d-47ab-974c-1b68c9cfb536", display: "Ajmal" },
  { value: "a63a6f77-c637-454e-abf2-dfb9b543af6c", display: "Ryan" },
];

const arrayTwo = [
  { value: "4a55eff3-1e0d-4a81-9105-3ddd7521d642", display: "Jamsheer" },
  { value: "644838b3-604d-4899-8b78-09e4799f586f", display: "Muhammed" },
  { value: "b6ee537a-375c-45bd-b9d4-4dd84a75041d", display: "Ravi" },
  { value: "e97339e1-939d-47ab-974c-1b68c9cfb536", display: "Ajmal" },
];

const results = arrayOne.filter(
  ({ value: id1 }) => !arrayTwo.some(({ value: id2 }) => id2 === id1)
);

console.log(results);

to call arrayOne.filter with a callback that calls arrayTwo.some to cheeck if there’s any object with id2, which is the _value property of the item in arrayTwo equal to id1, which is the _value property of the object being looped through in arrayOne.

Then an array with the items in arrayOne without the _value property equal to any entry in arrayTwo object’s _value property is returned.