Добавлен findMap

11e62be8 · Vladislav Lagunov · 9dedf5f9 · 11e62be8
Commit 11e62be8 authored Nov 13, 2018 by Vladislav Lagunov
Hide whitespace changes
Inline Side-by-side

Showing with 10 additions and 0 deletions

functions/find-map.ts
+10 -0

No files found.
--- a/functions/find-map.ts
+++ b/functions/find-map.ts
+
+/**
+ * Комбинация `Array.prototype.find` и `Array.prototype.map` 
+ */
+export default function findMap<A, B>(xs: A[], f: (a: A) => B|undefined): B|undefined {
+  for (const x of xs) {
+    const b_or_undefined = f(x);
+    if (b_or_undefined !== undefined) return b_or_undefined;
+  }
+}