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object FunTime {
val examples = Seq[String](
"07:04am",
"08:24pm",
"08:24am",
"09:39 am",
"08:24",
"11:59",
"12:00",
"12:01",
"12:34",
"13:37",
"20:24",
"18:04"
)
def getTime(time: String) : (Int, Int) = {
val h :: m :: _ = ("([0-9]{2})".r findAllIn time).toSeq
(h.toInt, m.toInt)
}
def makeTime(hour: Int, minute: Int, suffix: String = "") = {
"%02d:%02d%s".format(hour, minute, " " + suffix)
}
def to12H(time: String): String = {
val parsed = getTime(time)
val suffix = if (parsed._1 < 12) "am" else "pm"
val hour = if (parsed._1 > 12) parsed._1 - 12 else parsed._1
makeTime(hour, parsed._2, suffix)
}
def to24H(time: String): String = {
val parsed = getTime(time)
val hour = if (time.contains("pm")) parsed._1 + 12 else parsed._1
makeTime(hour, parsed._2)
}
def convert(time: String) : String = {
if (("(am|pm)$".r findFirstIn time).isDefined)
to24H(time)
else
to12H(time)
}
def main(args: Array[String]): Unit = {
examples
.map(convert)
.foreach(println)
}
}
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