add hw2

node_modules/radash/dist/esm/series.mjs

@@ -0,0 +1,60 @@
+import { list } from './array.mjs';
+
+const series = (items, toKey = (item) => `${item}`) => {
+  const { indexesByKey, itemsByIndex } = items.reduce(
+    (acc, item, idx) => ({
+      indexesByKey: {
+        ...acc.indexesByKey,
+        [toKey(item)]: idx
+      },
+      itemsByIndex: {
+        ...acc.itemsByIndex,
+        [idx]: item
+      }
+    }),
+    {
+      indexesByKey: {},
+      itemsByIndex: {}
+    }
+  );
+  const min = (a, b) => {
+    return indexesByKey[toKey(a)] < indexesByKey[toKey(b)] ? a : b;
+  };
+  const max = (a, b) => {
+    return indexesByKey[toKey(a)] > indexesByKey[toKey(b)] ? a : b;
+  };
+  const first = () => {
+    return itemsByIndex[0];
+  };
+  const last = () => {
+    return itemsByIndex[items.length - 1];
+  };
+  const next = (current, defaultValue) => {
+    return itemsByIndex[indexesByKey[toKey(current)] + 1] ?? defaultValue ?? first();
+  };
+  const previous = (current, defaultValue) => {
+    return itemsByIndex[indexesByKey[toKey(current)] - 1] ?? defaultValue ?? last();
+  };
+  const spin = (current, num) => {
+    if (num === 0)
+      return current;
+    const abs = Math.abs(num);
+    const rel = abs > items.length ? abs % items.length : abs;
+    return list(0, rel - 1).reduce(
+      (acc) => num > 0 ? next(acc) : previous(acc),
+      current
+    );
+  };
+  return {
+    min,
+    max,
+    first,
+    last,
+    next,
+    previous,
+    spin
+  };
+};
+
+export { series };
+//# sourceMappingURL=series.mjs.map