Which "Leap year counting" code run faster? - swift

Question

while practicing coding, I just caught up with question: which code will process faster in swift?
Is this one faster:
var aYear = Int(readLine()!)!
func isLeap(year: Int)
{
if aYear%400 == 0
{
print("YES")
}
else if aYear%4 == 0 && !(aYear%100 == 0)
{
print("YES")
}
else
{
print("NO")
}
}
isLeap(year: aYear)
Or this one faster?
var aYear = Int(readLine()!)!
func isLeap(year: Int) {
var leap = "NO"
if year % 4 == 0 {
leap = "YES"
}
if year % 100 == 0 {
leap = "NO"
}
if year % 400 == 0 {
leap = "YES"
}
print(leap)
}
isLeap(year: aYear)
Thank you. Have a great day :)

Answer 1

One way to check function performance is to this helper struct. Add the following to your project:
struct Benchmark {
static func testElapsedTimeFor(_ title: String, operation: #escaping ()->()) {
let startTime = CFAbsoluteTimeGetCurrent()
operation()
let timeElapsed = CFAbsoluteTimeGetCurrent() - startTime
print("Time elapsed for \(title): \(timeElapsed) s.")
}
// If you would like to get the double instead
static func testElapsedTimeFor(operation: #escaping ()->()) -> Double {
let startTime = CFAbsoluteTimeGetCurrent()
operation()
let timeElapsed = CFAbsoluteTimeGetCurrent() - startTime
return Double(timeElapsed)
}
}
And use it like so:
Benchmark.testElapsedTimeFor("First Function") {
self.isLeap(year: 2019)
}