Execute String Redis Commands with Node.js

We created a simple API that uses the set(), get(), and keys() methods from the redis npm package to work with Redis. Now, we’re going to go deeper and create a simple API that calculates 2 to the power of num. In this API, we’ll use Redis to store the result and return the same result if the user tries to provide the same value of num in the request. Essentially, we’re trying to reduce the calculation time and cache the data. This way, if a request is made for the same data again, we don’t need to perform the time-consuming calculation again and can just fetch the data from Redis to return it. We’ll also follow a singletonA design pattern in which a class can have at most one instance pattern for creating a Redis client instance. This allows us to reuse the same Redis client instance object to communicate and execute Redis operations instead of creating a new instance each time the request comes.

Creating a singleton class for the Redis client instance

We’ll follow the steps mentioned below to implement the class:

1. Creating a constructor: A constructor function is called each time an instance is created of that class. In the construction function, we check if there’s an existing instance of the class, then each time a new object is created, we return the same instance; else, we create a new instance.

2. Creating an initialization function: In this function, we implement the logic to create a Redis client and connect to Redis.

3. Creating a getter function: We also implement a getter function to get the Redis client instance.

Let’s now move to the implementation of the singleton class.