Function toString

toString(
    value?: boolean,
    truthy?: string,
    falsy?: string,
    nil?: string,
): undefined | string
Returns a string value from the boolean value
Parameters
- Optionalvalue: boolean
  the boolean value to check
- Optionaltruthy: string
  the string to represent true
- Optionalfalsy: string
  the string to represent false
- Optionalnil: string
  the string to represent undefined or null
Returns undefined | string
a string value from the boolean value
Author
David Hsing
Example
```
toString(undefined, 'true', 'false');    // 'true'
```