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Extensions add behaviors to existing types
Objects: Extensions
//Existing
protocol Exercising {
var heartRateIncrement : Int { get set }
func describe() -> String
}
class Walk : Exercising {
var heartRateIncrement : Int = 10
func describe() -> String { return "walking" }
}
//New
protocol Transporting {
func travelHowManyMiles(timeInMinutes: Float) -> Float
}
extension Walk : Transporting {
func travelHowManyMiles(timeInMinutes: Float) -> Float {
return timeInMinutes * 2.0 / 60.0
}
}
Extensions do not have to be implementations of protocols. Arbitrary functions can be in an extension
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