When should I use deep merge in JavaScript?

When should I use deep merge in JavaScript?

You should use deep merge when you need to combine two or more objects and want to ensure that nested properties are also merged, not just overwritten.

Can you give me an example of deep merging?

Sure! If you have two objects: const obj1 = { a: 1, b: { c: 2 } }; and const obj2 = { b: { d: 3 } };, a deep merge would result in { a: 1, b: { c: 2, d: 3 } }.

What libraries can I use for deep merging?

You can use libraries like Lodash with its _.merge function, or the deepmerge package for deep merging objects.

Are there any performance considerations with deep merging?

Yes, deep merging can be more performance-intensive than shallow merging, especially with large objects or deep nesting, so use it judiciously.