Euclidean Distance between two arrays of Double values in Swift

EuclideanDistance.swift

func euclideanDistance(first: [Double], second: [Double]) -> Double  {
    guard first.count == second.count else {
        fatalError("Vector space is not the same")
    }
    var result: Double = 0
    for i in 0..<first.count {
        result += pow(first[i] - second[i], 2.0)
    }
    return sqrt(result)
}