Function includes

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