Abstracted average function in Swift

average.swift

extension Sequence where Element: ExpressibleByIntegerLiteral  {
	private func abstractAverage<T>(sum: (T, T) -> T, div: (T, T) -> T) -> T where Element == T  {
		var i: T = 0
		var total: T = 0

		for value in self {
			total = sum(total, value)
			i = sum(i, 1)
		}

		return div(total, i)
	}
}

extension Sequence where Element: BinaryFloatingPoint {
	func average() -> Element {
		return abstractAverage(sum: +, div: /)
	}
}

extension Sequence where Element: BinaryInteger {
	func average() -> Element {
		return abstractAverage(sum: +, div: /)
	}
}

[1.0, 2.2, 3.0].average()
[1, 2, 3].average()