Function add

Utilities for array

Author

David Hsing

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