Function ifNotExistsThenWithReturn

Executes a callback if the value does not exist and returns the result

ifNotExistsThenWithReturn<T>(callback, value?): T
Type Parameters
- T
  The type of the value
Parameters
- callback: (() => T)
  The callback function to execute that returns a value
  - - (): T
    - Returns T
- Optionalvalue: T
  The value to check (optional)
Returns T
The result of the callback if value doesn't exist, otherwise the original value
- Defined in foundation/misc/MiscUtil.ts:350