$toUpper
Reference group: String aggregation expressions
What it does
Converts a string to uppercase.
Syntax
{$toUpper: stringExpr}
Use case
Normalize codes and labels.
$toUpper: practical example
{ $project: { code: { $toUpper: "$countryCode" } } }💡 Explanation
Converts a string to uppercase.
When to use it
Normalize codes and labels.
Key Takeaways
- Converts a string to uppercase.
- Typical use: Normalize codes and labels.