How Can I Efficiently Find the Differences Between Two JavaScript Arrays of Objects?

Retrieving Array Differences in JavaScript

Given two arrays of objects, it's desirable to identify their dissimilarities. In this regard, the following code snippet offers a solution:

const a = [{ value: "0", display: "Jamsheer" }, { value: "1", display: "Muhammed" }, { value: "2", display: "Ravi" }, { value: "3", display: "Ajmal" }, { value: "4", display: "Ryan" }];
const b = [{ value: "0", display: "Jamsheer" }, { value: "1", display: "Muhammed" }, { value: "2", display: "Ravi" }, { value: "3", display: "Ajmal" }];

// Equality comparison function
const isSameUser = (a, b) => a.value === b.value && a.display === b.display;

// Filter function to identify unique elements in the left array (a)
const onlyInLeft = (left, right, compareFunction) =>
  left.filter(leftValue =>
    !right.some(rightValue =>
      compareFunction(leftValue, rightValue)
    )
  );

// Apply the filter functions
const onlyInA = onlyInLeft(a, b, isSameUser);
const onlyInB = onlyInLeft(b, a, isSameUser);

// Concatenate the unique elements from both arrays
const result = [...onlyInA, ...onlyInB];

console.log(result);

This code effectively compares the arrays of objects using the provided comparison function (isSameUser) and identifies the unique elements in each array. The final result is an array containing these unique elements from both input arrays.

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