Leaderboard implementation in Redis - Mini Project: Build & Apply

Leaderboard Implementation with Redis

📖 Scenario: You are building a simple leaderboard for a game. Players earn points, and you want to keep track of their scores in order from highest to lowest.

🎯 Goal: Create a Redis sorted set to store player scores, add some players with their scores, update scores, and retrieve the top players.

📋 What You'll Learn

Create a Redis sorted set called game_leaderboard.

Add three players with exact scores: "Alice" with 1500, "Bob" with 1200, and "Charlie" with 1800.

Add a variable score_increment with value 300 to increase scores.

Increase Bob's score by score_increment.

Retrieve the top 3 players with their scores in descending order.

💡 Why This Matters

🌍 Real World

Leaderboards are common in games and apps to show top users or scores in real time.

💼 Career

Knowing how to use Redis sorted sets for leaderboards is useful for backend developers working on gaming, social, or analytics platforms.

1

Create the leaderboard sorted set with initial players

Use the Redis command ZADD to create a sorted set called game_leaderboard and add these players with their scores: 1500 "Alice", 1200 "Bob", and 1800 "Charlie".

Redis

# Use ZADD to add players and scores to game_leaderboard
# Your code here

Need a hint?

Use ZADD followed by the sorted set name, then pairs of score and member.

2

Add a score increment variable

Create a Redis string key called score_increment and set its value to 300.

Redis

ZADD game_leaderboard 1500 Alice 1200 Bob 1800 Charlie
# Set score_increment to 300
# Your code here

Need a hint?

Use SET to create a string key with the value 300.

3

Increase Bob's score by the increment

Use the Redis command ZINCRBY to increase Bob's score in game_leaderboard by the value stored in score_increment. Use GET score_increment to retrieve the increment value.

Redis

ZADD game_leaderboard 1500 Alice 1200 Bob 1800 Charlie
SET score_increment 300
# Increase Bob's score by score_increment
# Your code here

Need a hint?

Use ZINCRBY with the sorted set name, increment value, and member name.

4

Retrieve the top 3 players with scores

Use the Redis command ZREVRANGE on game_leaderboard to get the top 3 players with their scores. Include the WITHSCORES option to see scores.

Redis

ZADD game_leaderboard 1500 Alice 1200 Bob 1800 Charlie
SET score_increment 300
ZINCRBY game_leaderboard 300 Bob
# Retrieve top 3 players with scores
# Your code here

Need a hint?

ZREVRANGE returns members in descending order by score. Use 0 2 to get top 3.