Function includes

includes<E>(array?: E[] | readonly E[] | null, element?: E | null): boolean
Returns whether the given array includes the given element
Type Parameters
- E
Parameters
- Optionalarray: E[] | readonly E[] | null
  The array to check
- Optionalelement: E | null
  The element to compare
Returns boolean
whether the given array includes the given element
Author
David Hsing
Example
```
includes(['foo', 'bar'], 'foo');    // true
```