Test whether the int is in a range
- range: The range to check
A boolean whether the int is in range.
199.isIn(range: 0..<200) //Range
// -> true
200.isIn(range: 0..<200)
// -> false
199.isIn(range: 0...200) //ClosedRange
// -> true
200.isIn(range: 0...200)
// -> true