4
Harnessing the Power of Expressions
In this chapter, you will learn about the different types of aggregation expressions, how to combine them, and how they can help you enhance your aggregation pipelines. Using nested expressions can be highly effective for solving complex problems, particularly those involving arrays. Since nesting introduces added complexity, this chapter devotes significant attention to guiding you through the intricacies of crafting composite expressions for array processing.
To summarize, you will learn the following key concepts in this chapter:
- Types of aggregation expressions
- How to chain expressions together
- The power array operators
- Conditional comparisons
- Techniques for looping through and processing array elements ...
Get Practical MongoDB Aggregations now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
