bool array performance test.swift

import UIKit

// test harness
func timeBlock(block: () -> Void) {
    let start = clock()
    block()
    let diff = clock() - start
    let msec = diff * 1000 / UInt(CLOCKS_PER_SEC)
    print("Time taken: \(msec) milliseconds")
}

// Input string
let input:String = "0101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101"

print("input character count: \(input.characters.count)")

// test 1
timeBlock {
    let inputBytes = input.nulTerminatedUTF8
    var output = Array<Bool>(count: inputBytes.count - 1, repeatedValue: false)
    for (i, val) in inputBytes.enumerate() {
        if val == 49 {
            output[i] = true
        }
    }
}

// test 2
timeBlock {
    var output = [Bool]()
    output.reserveCapacity(input.characters.count)
    for char in input.characters {
        output.append(char == "1")
    }
}

results.txt

input character count: 1024
Time taken: 106 milliseconds
Time taken: 3966 milliseconds