hai

1 files changed, 24 insertions, 0 deletions

diff --git a/tst/memoize.test.ts b/tst/memoize.test.ts
new file mode 100644
index 0000000..e3d9050
--- /dev/null
+++ b/tst/memoize.test.ts
@@ -0,0 +1,24 @@
+import { memoize } from '@emprespresso/pengueno';
+
+interface RefCounter {
+    inc(by: number): number;
+}
+
+test('memoizes', () => {
+    let _c = 0;
+    const c: RefCounter = {
+        inc(by: number): number {
+            _c += by;
+            return _c;
+        },
+    };
+
+    const incBy = memoize((n: number) => c.inc(n));
+
+    expect(incBy(1)).toBe(1);
+    expect(incBy(2)).toBe(3);
+    expect(incBy(20)).toBe(23);
+    expect(incBy(20)).toBe(23);
+    expect(incBy(1)).toBe(1);
+    expect(incBy(2)).toBe(3);
+});