Function maybe

maybe<T>(value: undefined | T): T[]
Converts an optional value to an array, handling undefined cases.
Type Parameters
- T
  The type of the input value
Parameters
- value: undefined | T
  Optional input value
Returns T[]
An array containing the value, or an empty array if undefined
Example
```
maybe(5)       // [5]
maybe(undefined) // []
```
- Defined in itertools.ts:75