Function reverseRgb

reverseRgb(rgb?): string | undefined
Returns the reversed rgb color from the given color
Parameters
- Optionalrgb: string | [r: number, g: number, b: number]
  the rgb color to inspect
Returns string | undefined
the reversed rgb color from the given color
Example
```
reverseRgb('rgb(0, 0, 0)');    // 'rgb(255, 255, 255)'
reverseRgb([255, 255, 255]);    // 'rgb(0, 0, 0)'
```