The big refactor TM

1 files changed, 14 insertions, 0 deletions

diff --git a/u/leftpadesque/memoize.ts b/u/leftpadesque/memoize.ts
new file mode 100644
index 0000000..95e6019
--- /dev/null
+++ b/u/leftpadesque/memoize.ts
@@ -0,0 +1,14 @@
+import type { Callable } from "@emprespresso/pengueno";
+
+export const memoize = <R, F extends Callable<R>>(fn: F): F => {
+  const cache = new Map<string, R>();
+  return ((...args: unknown[]): R => {
+    const key = JSON.stringify(args);
+    if (cache.has(key)) {
+      return cache.get(key)!;
+    }
+    const res = fn.apply(args);
+    cache.set(key, res);
+    return res;
+  }) as F;
+};