frontend: get rid of evil eval function in table sorting

frontend/src/components/manga/util.manga.ts

@@ -18,3 +18,29 @@ export function newChapterCount(entry: ViewEntry): number {
   const max = entry.media?.chapters || entry.chapters.reduce((l, r) => Math.max(l, r.chapter), 0);
   return Math.max(0, max - entry.entry.progress);
 }
+
+/**
+ * Dynamically get a nested value from an array or
+ * object with a string.
+ *
+ * @example get(person, 'friends[0].name')
+ * @link https://github.com/rayepps/radash/blob/master/src/object.ts#L214
+ */
+export const get = <TDefault = unknown>(
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  value: any,
+  path: string,
+  defaultValue?: TDefault
+): TDefault => {
+  const segments = path.split(/[.[\]]/g)
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  let current: any = value
+  for (const key of segments) {
+    if (current === null) return defaultValue as TDefault
+    if (current === undefined) return defaultValue as TDefault
+    if (key.trim() === '') continue
+    current = current[key]
+  }
+  if (current === undefined) return defaultValue as TDefault
+  return current
+}