tuple matching

let squareSize = (1200.0, 900.0)

if squareSize.0 == 1200 && squareSize.1 = 900 {

print ("nice square")

}

// By using switch

switch squreSize {

case (1200, 900):

print ("nice square")

default:

break

}

// more usage

switch squareSize {

case let (w, h) where w / h == 4.0 / 3.0:

print ("4:3 ratio")

case (1200...1600, 900):

print ("still nice")

default:

break

}