Function emptyAsNull

emptyAsNull<E>(array?: E[] | null): (E | null)[] | null | undefined
Returns a array that replaced the empty element to null from the given array
Type Parameters
- E
Parameters
- Optionalarray: E[] | null
  The arrays to inspect
Returns (E | null)[] | null | undefined
a array that replaced the empty element to null from the given array
Author
David Hsing
Example
```
emptyAsNull(['foo', 'bar']);    // ['foo', 'bar']
emptyAsNull(['foo', '']);    // ['foo', null]
emptyAsNull(['', 'bar']);    // [null, 'bar']
```