갤러리 페이지 구현

src/lib/utils/sort.ts

@@ -0,0 +1,57 @@
+interface SortEntry {
+  name?: string;
+  date?: Date;
+}
+
+export enum SortBy {
+  NAME_ASC,
+  NAME_DESC,
+  DATE_ASC,
+  DATE_DESC,
+}
+
+type SortFunc = (a: SortEntry, b: SortEntry) => number;
+
+const collator = new Intl.Collator(undefined, { numeric: true, sensitivity: "base" });
+
+const sortByNameAsc: SortFunc = ({ name: a }, { name: b }) => {
+  if (a && b) return collator.compare(a, b);
+  if (a) return -1;
+  if (b) return 1;
+  return 0;
+};
+
+const sortByNameDesc: SortFunc = (a, b) => -sortByNameAsc(a, b);
+
+const sortByDateAsc: SortFunc = ({ date: a }, { date: b }) => {
+  if (a && b) return a.getTime() - b.getTime();
+  if (a) return -1;
+  if (b) return 1;
+  return 0;
+};
+
+const sortByDateDesc: SortFunc = (a, b) => -sortByDateAsc(a, b);
+
+export const sortEntries = <T extends SortEntry>(entries: T[], sortBy: SortBy) => {
+  let sortFunc: SortFunc;
+
+  switch (sortBy) {
+    case SortBy.NAME_ASC:
+      sortFunc = sortByNameAsc;
+      break;
+    case SortBy.NAME_DESC:
+      sortFunc = sortByNameDesc;
+      break;
+    case SortBy.DATE_ASC:
+      sortFunc = sortByDateAsc;
+      break;
+    case SortBy.DATE_DESC:
+      sortFunc = sortByDateDesc;
+      break;
+    default:
+      const exhaustive: never = sortBy;
+      sortFunc = exhaustive;
+  }
+
+  entries.sort(sortFunc);
+};