Saving and retrieving data

First, let's look at what the Redis client has to offer us. Add the following lines to index.js:

client.set('hello', 'Hello World!');

client.get('hello', (err, reply) => {
  if (err) {
    console.log(err);
    return;
  }

  console.log(`Retrieved: ${reply}`);
});

In this example, we will set the value "Hello world!" in Redis with the key hello. In the get command, we specify the key we wish to use to retrieve a value.

Note

The Node Redis client is entirely asynchronous. This means that you have to supply a callback function with each command if you wish to process data.

A common mistake is to use the Node Redis client in a synchronous way. Here's an example:

let val = client.get('hello');
console.log('val:', val);

This, perhaps confusingly, results in:

val: false

This is because the get function will have returned the Boolean false before the request to the Redis server has been made.

Run the correct...