Memoization in JavaScript

Memoization is an optimization technique that stores the results of expensive function calls and returns the cached result when the same inputs occur again.

In other words, memoization is a way to speed up a function by storing its previously computed results and returning them instead of recomputing the result whenever the function is called with the same arguments.

This is not only valid for JavaScript but also for other programming languages. In this article, we will take a closer look at memoization.

As described above, in JavaScript, a memoized function is a function that remembers the results of previous calls and returns the cached result instead of executing the function again.

This can be useful for improving the performance of functions that are called repeatedly with the same arguments.

How to Create a Memoized Function

Memoized functions are used to improve the performance of functions that are called repeatedly with the same arguments. They can be a bit tricky to understand. In the below, you can see a very simple example of how to create a memoized function:

function add(a, b) {
  // Create an object to store the results of previous calls to the add function
  let cache = {};
// Return a function that takes in two numbers as arguments
  return function(a, b) {
    // Create a string representation of the arguments to use as a key in the cache object
    let key = `${a},${b}`;
    // If the result for these arguments is in the cache, return it
    if (key in cache) {
      return cache[key];
    } else {
      // Otherwise, calculate the result and store it in the cache before returning it
      let result = a + b;
      cache[key] = result;
      return result;
    }
  }
}
// Create a memoized version of the add function
const memoizedAdd = add();
console.log(memoizedAdd(2, 3)); // 5
console.log(memoizedAdd(2, 3)); // 5 (returns cached result)

In short, you can define a function as a closure that stores a cache object.

The cache object is used to store the results of previous function calls.

When the function is called with specific arguments, it checks to see if the result is already in the cache. If it is, it…