$size
Reference group: Array query operators
What it does
Matches arrays with exactly n elements.
Syntax
{ arrayField: { $size: n } }
Use case
Find arrays of exact length.
Important notes
Query $size does not directly support arbitrary ranges.
$size: practical example
db.posts.find({ tags: { $size: 3 } })💡 Explanation
Matches arrays with exactly n elements.
When to use it
Find arrays of exact length.
Caution
Query
$size does not directly support arbitrary ranges.Key Takeaways
- Matches arrays with exactly n elements.
- Typical use: Find arrays of exact length.