Function startsWith

startsWith(text?, prefix?): boolean
Returns whether the given string starts with the prefix
Parameters
- Optionaltext: null | string
  the source string to check
- Optionalprefix: null | string
  the target string to compare
Returns boolean
whether the given string starts with the prefix
Example
```
startsWith('foobar', 'foo');    // true
startsWith('hello', 'bar');    // false
```