What are the differences between merge methods in JavaScript?

What are the differences between the merge methods in JavaScript?

In JavaScript, the main merge methods are Object.assign(), the spread operator (...), and Array.prototype.concat(). Each has its own use cases and behaviors.

Can you explain how Object.assign() works?

Sure! Object.assign() copies the values of all enumerable own properties from one or more source objects to a target object. It returns the target object.

What about the spread operator? How is it different?

The spread operator (...) allows you to expand an iterable (like an array) into individual elements. It's often used for merging arrays or objects in a more concise way.

Are there any performance differences between these methods?

Yes, performance can vary based on the method and the size of the objects or arrays being merged. Generally, the spread operator is more performant for smaller datasets, while Object.assign() can handle larger objects more efficiently.