Welcome back to our Redis course! Now that you know how to connect to a Redis server, it's time to move forward and explore how to work with numbers in Redis. This unit builds on our previous lesson, so make sure you're comfortable establishing a connection to a Redis server.

In this lesson, you will learn how to:

1. Set numeric values in Redis.
2. Retrieve and log numeric values.

Here's the code snippet that we'll be working with:

JavaScript
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1import { createClient } from 'redis';
2
3// Create and connect Redis client
4const client = createClient({ url: 'redis://localhost:6379' });
5
6client.on('error', (err) => console.log('Redis Client Error', err));
7
8await client.connect();
9
10// Setting and getting numeric values
11await client.set('count', 5);
12await client.set('completion_rate', 95.5);
13
14const count = await client.get('count');
15const completion_rate = await client.get('completion_rate');
16
17console.log(`Course count: ${count}, Completion rate: ${completion_rate}`);
18
19await client.disconnect();

Let's break down the code:

• We use modern ES6 import syntax to import the createClient function from the redis library.
• The Redis client is created with createClient and connected to the Redis server at 'redis://localhost:6379'.
• The client is set to log any connection errors.
• The connection to the Redis server is established using await client.connect().
• We set numeric values using the set method: count with a value of 5 and completion_rate with a value of 95.5.
• We retrieve these values using the get method. Note that in JavaScript, the return type of the get method is a string, so there's no need to decode it.
• Finally, the client disconnects from the Redis server using await client.disconnect().

Working with numbers in Redis is crucial because many real-world applications involve numeric data. From tracking user statistics to monitoring system performance, managing numbers in Redis allows you to perform a variety of useful operations efficiently. By mastering these basic operations with numbers, you'll be well-prepared to tackle more complex tasks and optimize your applications.

Ready to dive in? Let's move on to the practice section and get hands-on experience working with numbers in Redis!