How Can I Effectively Compare Objects for Equality in JavaScript?

How to Compare Objects for Equality in JavaScript

Determining object equality in JavaScript can be tricky due to the absence of a dedicated hash code function like Java. However, there are methods to achieve this comparison.

lodash.isEqual()

To check for deep equality of objects, consider using Lodash's _.isEqual() function. It recursively checks the key-value pairs of both objects, ensuring identical content.

_.isEqual(object1, object2);

Brute-Force Approach

Another approach involves manually checking each key-value pair:

const keys1 = Object.keys(object1);
const keys2 = Object.keys(object2);

if (keys1.length !== keys2.length) {
  return false;
}

for (let key of keys1) {
  if (object1[key] !== object2[key]) {
    return false;
  }
}

return true;

Recommendations

Lodash is recommended for convenience and its optimized performance. For more complex scenarios, you can implement your own solution based on specific requirements. However, keep in mind that JavaScript's strict equality operator (===) only checks for object type equality, not object content equality.

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