test.ts

import { defaultMemoize } from "./memoizedSelector";
import { slowFunction } from "./slowFunction";

// run slowFunction without memoization
console.log("First call of slowFunction(2)");
let pre = new Date();
slowFunction(2);
console.log("It takes" + ((new Date()).valueOf() - pre.valueOf())/1000 +  "seconds \n");
console.log("Second call of slowFunction(2)");
pre = new Date();
slowFunction(2);
console.log("It takes" + ((new Date()).valueOf() - pre.valueOf())/1000 +  "seconds \n");

// run slowFunction with memoization

const fastFunction = defaultMemoize(slowFunction);
console.log("First call of fastFunction(2)");
pre = new Date();
fastFunction.memoized(2);
console.log("It takes" + ((new Date()).valueOf() - pre.valueOf())/1000 +  "seconds \n");
console.log("Second call of fastFunction(2)");
pre = new Date();
fastFunction.memoized(2);
console.log("It takes" + ((new Date()).valueOf() - pre.valueOf())/1000 +  "seconds \n");