Function prependIfMissingIgnoreCase

prependIfMissingIgnoreCase(
text?: null | string,
prefix?: string,
): undefined | null | string
Returns a string that concat the given prefix and text, case-insensitive
Parameters
- Optionaltext: null | string
  the text to check
- Optionalprefix: string
  the prefix to prepend
Returns undefined | null | string
a string that concat the given prefix and text, case-insensitive
Author
David Hsing
Example
```
prependIfMissingIgnoreCase('bar', 'foo');    // 'foobar'
prependIfMissingIgnoreCase('foobar', 'FOO');    // 'foobar'
```