$isArray
Reference group: Array aggregation expressions
What it does
Returns true if the expression resolves to an array.
Syntax
{$isArray: expression}
Use case
Guard against inconsistent imported data.
$isArray: practical example
{ $project: { isArray: { $isArray: "$tags" } } }💡 Explanation
Returns true if the expression resolves to an array.
When to use it
Guard against inconsistent imported data.
Key Takeaways
- Returns true if the expression resolves to an array.
- Typical use: Guard against inconsistent imported data.