Function leftPad

leftPad(
    text?: null | string,
    size?: number,
    pad?: null | string,
): undefined | null | string
Returns the left padded string with the given size and string, or original string if no padding is necessary
Parameters
- Optionaltext: null | string
  the source string to inspect
- Optionalsize: number
  the size to pad to
- Optionalpad: null | string
  the target string to fill, default is space
Returns undefined | null | string
the left padded string with the given size and string, or original string if no padding is necessary
Author
David Hsing
Example
```
leftPad(undefined, -1, null);    // undefined
leftPad('', 3, 'z');    // 'zzz'
leftPad('foo', 3, 'z');    // 'foo'
leftPad('foo', 8, 'yz')  = 'yzyzyfoo'
```