一部functionの分岐

lib/eachTrainInfoCoreLib/openBackTrainInfo.js

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+export const openBackTrainInfo = (stationInfo, trainData, showNearTrain) => {
+  const migrationArray = (stationInfo) => {
+    const mainTrainStationPosition = trainData.findIndex(
+      (d) => d.split(",")[0] == stationInfo
+    );
+
+    const relationMain = (() => {
+      if (mainTrainStationPosition == 0) return "head";
+      if (mainTrainStationPosition == trainData.length - 1) return "tail";
+      return "middle";
+    })();
+
+    const subTrainStationPosition = showNearTrain.findIndex(
+      (d) => d.split(",")[0] == stationInfo
+    );
+    const relationSub = (() => {
+      if (subTrainStationPosition == 0) return "head";
+      if (subTrainStationPosition == showNearTrain.length - 1) return "tail";
+      return "middle";
+    })();
+
+    switch (relationMain) {
+      case "head":
+        if (relationSub == "head") {
+          return;
+        } else if (relationSub == "tail") {
+          return [
+            ...showNearTrain.slice(0, subTrainStationPosition),
+            ...trainData,
+          ];
+        } else if (relationSub == "middle") {
+          return [
+            ...showNearTrain.slice(0, subTrainStationPosition),
+            ...trainData,
+          ];
+        } else return;
+      case "tail":
+        if (relationSub == "head") {
+          return [
+            ...trainData.slice(0, mainTrainStationPosition),
+            ...showNearTrain,
+          ];
+        } else if (relationSub == "tail") {
+          return;
+        } else if (relationSub == "middle") {
+          return [
+            ...trainData.slice(0, mainTrainStationPosition),
+            ...showNearTrain.slice(subTrainStationPosition),
+          ];
+        } else return;
+      case "middle":
+        if (relationSub == "head") {
+          return [
+            ...trainData.slice(0, mainTrainStationPosition),
+            ...showNearTrain,
+          ];
+        } else if (relationSub == "tail") {
+          return [
+            ...showNearTrain.slice(0, subTrainStationPosition),
+            ...trainData.slice(mainTrainStationPosition),
+          ];
+        } else return;
+    }
+  };
+  const array = migrationArray(stationInfo);
+  if (!array) return null;
+  return array;
+};