2 files changed, 15 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;
+};
diff --git a/u/leftpadesque/mod.ts b/u/leftpadesque/mod.ts
index 801846a..63d8d7a 100644
--- a/u/leftpadesque/mod.ts
+++ b/u/leftpadesque/mod.ts
@@ -1,3 +1,4 @@
 export * from "./object.ts";
 export * from "./prepend.ts";
 export * from "./debug.ts";
+export * from "./memoize.ts";