How to Find the Differences Between Two Arrays of Objects in JavaScript?

Finding Differences Between Arrays of Objects in JavaScript

Given two arrays of objects with similar structures, it can be necessary to determine the objects that are unique to each array. This scenario arises when comparing result sets or performing data reconciliation. In JavaScript, finding the difference between arrays of objects can be achieved through a combination of filtering and comparison.

To identify the unique objects in each array, we can first define a comparison function that evaluates whether two objects are equivalent based on their properties. For example:

const isSameUser = (a, b) => a.value === b.value && a.display === b.display;

Next, we can utilize the filter method to iterate through one array and select the objects that are not present in the other array, according to the comparison function.

const onlyInLeft = (left, right, compareFunction) =>
  left.filter(leftValue => !right.some(rightValue => compareFunction(leftValue, rightValue)));

By applying this technique to both arrays, we can obtain two arrays containing the unique objects for each:

const onlyInA = onlyInLeft(a, b, isSameUser);
const onlyInB = onlyInLeft(b, a, isSameUser);

Finally, we can combine the unique objects from both arrays into a single result:

const result = [...onlyInA, ...onlyInB];

The resulting result array will contain the objects that are unique to both arrays, providing a comprehensive representation of the differences between them.

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