init commit

shared/components/src/utils/memoize.ts

@@ -0,0 +1,26 @@
+// eslint-disable-next-line import/prefer-default-export
+export function memoize<T extends unknown[], S>(
+    fn: (...args: T) => S,
+    hashFn: (...args: unknown[]) => string = JSON.stringify,
+    entryLimit = 5,
+): (...args: T) => S {
+    const cache: Map<string, S> = new Map();
+
+    return (...args: T) => {
+        const value = hashFn(args);
+        if (cache.has(value)) {
+            return cache.get(value);
+        }
+
+        const returnedValue: S = fn.apply(this, args);
+
+        if (cache.size >= entryLimit) {
+            const iterator = cache.keys();
+            const firstValue = iterator.next().value;
+            // remove oldest value
+            cache.delete(firstValue);
+        }
+        cache.set(value, returnedValue);
+        return returnedValue;
+    };
+}