Function includes

includes(text?: null | string, comparison?: null | string): boolean
Returns whether the given text includes the comparison string
Parameters
- Optionaltext: null | string
  the source string to check
- Optionalcomparison: null | string
  the target string to compare
Returns boolean
whether the given text includes the comparison string
Author
David Hsing
Example
```
includes('foobar', 'foo');    // true
```