StringBenchmark

fun main(args: Array<String>) {
    val range = 1..10000

    logTime("benchmarkPlusOperator") { benchmarkPlusOperator(range) }
    logTime("benchmarkStringAppend") { benchmarkStringAppend(range) }
}

fun benchmarkPlusOperator(range:IntRange) {
    var str = ""
    range.forEach { str += "abc" }
}

fun benchmarkStringAppend(range: IntRange) {
    val stringBuilder = StringBuilder()
    range.forEach { stringBuilder.append("abc") }
    stringBuilder.toString()
}

inline fun logTime(name:String, func:() -> Unit) {
    val startTime = System.currentTimeMillis()
    func()
    val endTime = System.currentTimeMillis()
    println("$name execution duration: ${ endTime - startTime }ms")
}