Switch - case - where construction

SwitchCaseWhere.swift

let point1 = (1.5, 0.5)
let point2 = (1.0, 0.0)
let point3 = (0.5, 0.5)

for point in [point1, point2, point3] {
  switch point {
  case let (x, y) where pow(x, 2) + pow(y, 2) < 1.0:
    print("Point \(x), \(y) is inside the circle")

  case let (x, y) where pow(x, 2) + pow(y, 2) == 1.0:
    print("Point \(x), \(y) is on the circle border")

  case let (x, y):
    print("Point \(x), \(y) is outside the circle")
  }
}