Redis with Node.js (ioredis) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new Redis client using ioredis.

Redis

const Redis = require('ioredis');
const redis = new [1]();

Drag options to blanks, or click blank then click option'

ARedis

Bredis

Cioredis

Dclient

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase 'redis' instead of 'Redis' causes an error.

Trying to use 'client' without importing it.

The Redis class from the ioredis package is used to create a new Redis client instance.

2fill in blank

medium

Complete the code to set a key 'name' with value 'Alice' in Redis.

Redis

await redis.[1]('name', 'Alice');

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Aset

Bdel

Cget

Dexists

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'get' instead of 'set' will not store the value.

Using 'del' deletes keys, not sets them.

The set command stores a key-value pair in Redis.

3fill in blank

hard

Fix the error in the code to get the value of key 'name' from Redis.

Redis

const value = await redis.[1]('name');

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Aset

Bdel

Cget

Dexists

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'set' instead of 'get' causes the value to be overwritten.

Using 'del' deletes the key instead of reading it.

The get command retrieves the value stored at the given key.

4fill in blank

hard

Fill both blanks to delete the key 'name' and check if it still exists.

Redis

await redis.[1]('name');
const exists = await redis.[2]('name');

Drag options to blanks, or click blank then click option'

Adel

Bexists

Cget

Dset

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'get' to delete a key does not work.

Using 'set' to check existence is incorrect.

The del command deletes a key, and exists checks if the key is still present.

5fill in blank

hard

Fill all three blanks to increment a counter, get its value, and then reset it to zero.

Redis

await redis.[1]('counter');
const count = await redis.[2]('counter');
await redis.[3]('counter', 0);

Drag options to blanks, or click blank then click option'

Aincr

Bget

Cset

Ddel

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'set' to increment does not work.

Using 'del' instead of 'set' to reset deletes the key.

incr increases the counter by 1, get retrieves its value, and set resets it to zero.