$add
Reference group: Arithmetic expressions
What it does
Adds numeric values; date-plus-milliseconds behavior is supported in applicable cases.
Syntax
{$add: [expr, ...]}
Use case
Calculate totals or offsets.
$add: practical example
{ $project: { gross: { $add: ["$subtotal", "$tax", "$shipping"] } } }💡 Explanation
Adds numeric values; date-plus-milliseconds behavior is supported in applicable cases.
When to use it
Calculate totals or offsets.
Key Takeaways
- Adds numeric values; date-plus-milliseconds behavior is supported in applicable cases.
- Typical use: Calculate totals or offsets.