When merging two objects in javascript, you can _shallow_ merge them, or _deep_ merge them.  These videos show how to do both, and talk about the pros and cons of each approach. 

This lesson looks at three methods that can be used to shallow merge two objects in javascript: `Object.assign`, both with mutating the original object and without mutation, and the spread operator.

It also covers the potential danger of doing a shallow merge instead of a deep merge, by showing an example of merging two objects that have objects as values, instead of simple strings.

Shallow Merge Two Objects in JavaScript

If you are merging two objects that contain other objects or arrays, then you probably want to deeply merge those objects, instead of just shallow merging them.  In this lesson, we'll look at three different ways to deeply merge objects, depending on what you want to accomplish: using the spread operator, using lodash's `merge` function, or using the `deepmerge` npm library.

Merge Objects in JavaScript

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