When should I use shallow merge vs deep merge?

What’s the difference between shallow merge and deep merge?

A shallow merge combines properties of two objects at the first level, while a deep merge combines all nested properties.

When should I use a shallow merge?

Use a shallow merge when you only need to combine top-level properties and don't care about nested objects.

And when is a deep merge necessary?

A deep merge is necessary when you need to combine nested objects and ensure all properties are merged correctly.

Can you give me an example of each?

Sure! For shallow merge: {a: 1, b: 2} and {b: 3} results in {a: 1, b: 3}. For deep merge: {a: {x: 1}} and {a: {y: 2}} results in `{a: {x: 1, y: 2}}.