Tweak feed display

2025-04-25 17:17:18 -07:00
parent 37c0491d71
commit b3e8d7a332
6 changed files with 37 additions and 20 deletions
@@ -628,6 +628,21 @@ export const groupBy = <T, K>(f: (x: T) => K, xs: T[]) => {
  return r
 }

+/**
+ * Counts array elements by key function
+ * @param f - Function to generate group key
+ * @param xs - Array to count entries
+ * @returns Map of counts
+ */
+export const countBy = <T, K>(f: (x: T) => K, xs: T[]) => {
+  const r = new Map<K, number>()
+  for (const [k, items] of groupBy(f, xs)) {
+    r.set(k, items.length)
+  }
+
+  return r
+}
+
 /**
 * Creates map from array using key function
 * @param f - Function to generate key