A friend of mine runs a pharmacy.   He has a specialized function in his Dispensary application which receives a decimal value of currency and replaces it to a standard value.   This value is regulated by a government department.



Task

Given a floating point value between   0.00   and   1.00,   rescale according to the following table:

>=  0.00  <  0.06  :=  0.10
>=  0.06  <  0.11  :=  0.18
>=  0.11  <  0.16  :=  0.26
>=  0.16  <  0.21  :=  0.32
>=  0.21  <  0.26  :=  0.38
>=  0.26  <  0.31  :=  0.44
>=  0.31  <  0.36  :=  0.50
>=  0.36  <  0.41  :=  0.54
>=  0.41  <  0.46  :=  0.58
>=  0.46  <  0.51  :=  0.62
>=  0.51  <  0.56  :=  0.66
>=  0.56  <  0.61  :=  0.70
>=  0.61  <  0.66  :=  0.74
>=  0.66  <  0.71  :=  0.78
>=  0.71  <  0.76  :=  0.82
>=  0.76  <  0.81  :=  0.86
>=  0.81  <  0.86  :=  0.90
>=  0.86  <  0.91  :=  0.94
>=  0.91  <  0.96  :=  0.98
>=  0.96  <  1.01  :=  1.00



let ranges = [
  (0.00..<0.06, 0.10),
  (0.06..<0.11, 0.18),
  (0.11..<0.16, 0.26),
  (0.16..<0.21, 0.32),
  (0.21..<0.26, 0.38),
  (0.26..<0.31, 0.44),
  (0.31..<0.36, 0.50),
  (0.36..<0.41, 0.54),
  (0.41..<0.46, 0.58),
  (0.46..<0.51, 0.62),
  (0.51..<0.56, 0.66),
  (0.56..<0.61, 0.70),
  (0.61..<0.66, 0.74),
  (0.66..<0.71, 0.78),
  (0.71..<0.76, 0.82),
  (0.76..<0.81, 0.86),
  (0.81..<0.86, 0.90),
  (0.86..<0.91, 0.94),
  (0.91..<0.96, 0.98),
  (0.96..<1.01, 1.00)
]
 
func adjustDouble(_ val: Double, accordingTo ranges: [(Range<Double>, Double)]) -> Double? {
  return ranges.first(where: { $0.0.contains(val) })?.1
}
 
for val in stride(from: 0.0, through: 1, by: 0.01) {
  let strFmt = { String(format: "%.2f", $0) }
 
  print("\(strFmt(val)) -> \(strFmt(adjustDouble(val, accordingTo: ranges) ?? val))")
}