Swift removeFirst/Last micro benchmark

main.swift

//
//  main.swift
//  microbenchmark
//
//  Created by Christopher Durham on 7/29/16.
//  Copyright © 2016 Christopher Durham. All rights reserved.
//

import Foundation

let TRIALS = 600
let ITERATIONS = 10_000

// MARK: removeFirst

var firstTest: [TimeInterval] = []

let startFirstTest = Date()

for _ in 1...TRIALS {
    var test = Array(repeating: 5, count: ITERATIONS)
    let start = Date()
    
    while test.count > 0 {
        test.removeFirst()
    }
    
    let end = Date()
    firstTest.append(end.timeIntervalSince(start))
}

let endFirstTest = Date()
let firstTestTime = endFirstTest.timeIntervalSince(startFirstTest)

let firstSum = firstTest.reduce(0, combine: +)
let firstAvg = firstSum / Double(firstTest.count)

let firstMax = firstTest.reduce(DBL_MIN, combine: {$0 > $1 ? $0 : $1})
let firstMin = firstTest.reduce(DBL_MAX, combine: {$0 < $1 ? $0 : $1})

print(String(format:"removeFirst took %f s for \(ITERATIONS) iterations over \(TRIALS) trials", firstAvg))
print(String(format: "with a max of %f and a min of %f . The test took %f s.", firstMax, firstMin, firstTestTime))
print()

// MARK: removeLast

var lastTest: [TimeInterval] = []

let startLastTest = Date()

for _ in 1...TRIALS {
    var test = Array(repeating: 5, count: ITERATIONS)
    let start = Date()
    
    while test.count > 0 {
        test.removeLast()
    }
    
    let end = Date()
    lastTest.append(end.timeIntervalSince(start))
}

let endLastTest = Date()
let lastTestTime = endLastTest.timeIntervalSince(startLastTest)

let lastSum = lastTest.reduce(0, combine: +)
let lastAvg = lastSum / Double(lastTest.count)

let lastMax = lastTest.reduce(DBL_MIN, combine: {$0 > $1 ? $0 : $1})
let lastMin = lastTest.reduce(DBL_MAX, combine: {$0 < $1 ? $0 : $1})

print(String(format:"removeLast took %f s for \(ITERATIONS) iterations over \(TRIALS) trials", lastAvg))
print(String(format: "with a max of %f and a min of %f . The test took %f s.", lastMax, lastMin, lastTestTime))
print()

/*
removeFirst took 0.096540 s for 10000 iterations over 600 trials
with a max of 0.165383 and a min of 0.095035 . The test took 57.938797 s.

removeLast took 0.083069 s for 10000 iterations over 600 trials
with a max of 0.145710 and a min of 0.082141 . The test took 49.852311 s.

Program ended with exit code: 0
*/