Merging objects efficiently is crucial for combining configuration objects, updating state, and handling data transformations in JavaScript applications. As the creator of CoreUI, a widely used open-source UI library, I’ve implemented object merging in thousands of component configurations over 25 years of development. From my expertise, the most elegant solution is the spread operator, which provides clean syntax and creates a new object without mutating the originals. This approach ensures immutability and prevents side effects.