Created utils functions within Pokedex

src/features/Pokedex/utils.ts

@@ -0,0 +1,11 @@
+import { RegionPokemonRange } from './types/slice';
+
+export const getStartAndEndIdsForRegion = (
+  region: string,
+  data: RegionPokemonRange[],
+): { startId: number; endId: number } => {
+  const regionData = data.find(data => data.region === region);
+  return regionData
+    ? { startId: regionData.startId, endId: regionData.endId }
+    : { startId: 0, endId: 0 };
+};