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import scala.collection.mutable.ListBuffer | |
val messageBoxes = Array.fill(3)(ListBuffer[String]()) | |
messageBoxes(0) += "message1" | |
messageBoxes(0) += "message2" | |
messageBoxes(0) += "message4" | |
messageBoxes(0) += "message5" | |
messageBoxes(1) += "message1" | |
messageBoxes(1) += "message2" | |
messageBoxes(1) += "message3" | |
messageBoxes(2) += "message2" | |
messageBoxes(2) += "message3" | |
messageBoxes(2) += "message4" | |
messageBoxes(2) += "message5" | |
// 方法1: zipWithIndexでインデックスを利用 | |
messageBoxes.zipWithIndex.foreach { case (messageBox, i) => | |
messageBox.foreach(println) | |
if (i < messageBoxes.length - 1) { | |
println("--") | |
} | |
} | |
// 方法2: initとlastを活用 | |
if (messageBoxes.nonEmpty) { | |
messageBoxes.init.foreach { messageBox => | |
messageBox.foreach(println) | |
println("--") | |
} | |
messageBoxes.last.foreach(println) | |
} | |
// 方法3: mkStringとsplitを活用 | |
messageBoxes.map(_.mkString("\n")).mkString("\n--\n").split("\n").foreach(println) |
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