feat:ChatGPT第 8 课：flatMap 和嵌套集合。

src/main/scala/practise8/demo/Demo5SplitFlatMap.scala

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+package practise8.demo
+
+/*
+* split + flatMap 拆分字符串*/
+object Demo5SplitFlatMap {
+  def main(args: Array[String]): Unit = {
+    val sentences = List(
+      "hello scala",
+      "hello spark"
+    )
+
+    // 使用map
+    val result = sentences.map(x => x.split(" ").toList)
+    println(result)
+
+    // 使用flatMap
+    val result2 = sentences.flatMap(x => x.split(" "))
+    println(result2)
+  }
+}