hai

1 files changed, 14 insertions, 0 deletions

diff --git a/lib/leftpadesque/memoize.ts b/lib/leftpadesque/memoize.ts
new file mode 100644
index 0000000..2f0e87a
--- /dev/null
+++ b/lib/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(...args);
+        cache.set(key, res);
+        return res;
+    }) as F;
+};