Nullish Coalescing Operator
The nullish coalescing operator allows you to provide fallback values when dealing with null or undefined values.
?? (nullish coalescing)
?? (Nullish Coalescing)
The ?? operator (nullish coalescing) returns the first non-null and non-undefined value from a list.
This is useful when you want to provide a series of fallback values.
Syntax
{ "??": [value1, value2, ...] }Parameters
| Parameter | Description |
|---|---|
| value1, value2, ... | Values to check in order until a non-null value is found |
Example: Basic Usage
Rule:
Data:
Result:
Example: Default Value
Rule:
Data:
Result:
Common Use Cases
- Providing default values for missing data
- Implementing fallback strategies for displaying user information
- Simplifying complex conditional logic for default values