задача 'asc' или 'desc'

02-javascript-data-types/1-sort-strings/index.js

@@ -4,6 +4,21 @@
  * @param {string} [param="asc"] param - the sorting type "asc" or "desc"
  * @returns {string[]}
  */
-export function sortStrings(arr, param = 'asc') {
-
+export function sortStrings(arr, param = "asc") {
+  if (param !== "asc" && param !== "desc") {
+    throw new Error("Должно быть 'asc' или 'desc'");
+  }
+  return arr.slice().sort((a, b) => {
+    if (param === "asc") {
+      return a.localeCompare(b, undefined, {
+        sensitivity: "variant",
+        caseFirst: "upper",
+      });
+    } else {
+      return b.localeCompare(a, undefined, {
+        sensitivity: "variant",
+        caseFirst: "upper",
+      });
+    }
+  });
 }