Function toString

toString(value?, truthy?, falsy?, nil?): string | undefined
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 string | undefined
a string value from the boolean value
Example
```
toString(undefined, 'true', 'false');    // 'true'
```