In JavaScript, you can compare two objects by comparing their properties and values. However, there are two types of object comparison: shallow comparison and deep comparison.
Shallow comparison compares the object references (memory addresses) and returns true only if both objects refer to the same location in memory. Deep comparison, on the other hand, compares the properties and values of the objects and returns true if they are equal.
Let’s write together an example of a function that performs a deep comparison between two objects in JavaScript:
ffunction areObjectsEqual(firstObject, secondObject) {
// Check if the objects have the same number of properties
if (Object.keys(firstObject).length !== Object.keys(secondObject).length) {
return false
}
// Check if the properties and values of the objects are equal
for (let key in firstObject) {
if (firstObject.hasOwnProperty(key)) {
if (!secondObject.hasOwnProperty(key)) {
return false
}
// Check if the type of the properties is object.
if (
typeof firstObject[key] === "object" &&
typeof secondObject[key] === "object"
) {
if (!areObjectsEqual(firstObject[key], secondObject[key])) {…