Function for check algorithm efficiency

Benchmark.swift

func benchmark(repeatCount: Int = 1, name: String? = nil, closure: () -> Void) {
    let d = CACurrentMediaTime()
    for _ in 0..<repeatCount {
        closure()
    }
    let d1 = CACurrentMediaTime() - d
    print("Benchmark of \(name ?? "closure") took \(d1) seconds")
}