Accelerate Your Code: Implementing a Cache Function in JavaScript

Introduction

In JavaScript, caching is a powerful technique that can greatly improve the performance of your code by storing the results of expensive function calls and returning the cached result when the same inputs occur again. This blog post will walk you through implementing a higher-order function called cacheFunction that can optimize function calls by caching their results.

We’ll also cover how to unit test this function to ensure it works as expected. Let’s dive in!

The Problem Statement

We want to implement a cacheFunction that takes another function as an argument and returns a cached version of that function. The caching mechanism should work as follows:

• For each unique set of arguments, the original function should only execute once.
• If the cached function is called again with the same arguments, it should return the cached result without recomputing.
• The solution should handle functions that accept multiple arguments.

Example:

Given the following code:

function sum(a, b) {
  return a + b;
}

const cachedSum = cacheFunction(sum);

console.log(cachedSum(1, 2)); //…