Function isAlphabeticLower

isAlphabeticLower(text?: null | string): boolean
Returns whether all the characters in the given text is lowercase alphabetic
Parameters
- Optionaltext: null | string
  the text to check
Returns boolean
whether all the characters in the given text is lowercase alphabetic
Author
David Hsing
Example
```
isAlphabeticLower('abc');    // true
isAlphabeticLower('abcDEF');    // false
isAlphabeticLower('abc123');    // false
isAlphabeticLower('123456');    // false
```