redis.js

//Lets Learn Redis!

// **** PreRequisites ****
// Have Reddis running on localhost, either by using docker or installing it directly on your machine

const redis = require("redis");
const client = redis.createClient();


// *** Basic Operations ***

//SET and GET
client.set("transactions", 123, redis.print)

client.get("transactions", redis.print)

client.del("transactions", redis.print)

client.get("transactions", redis.print)

// INCR and DECR
client.set("counter", 50, redis.print)
client.decr("counter", redis.print)

client.get("counter", redis.print)

// Set with TTL Expiry
client.set("test", "val", "EX", 5, redis.print)

client.get("test", redis.print)

// LISTS

client.rpush("transactions", "t1", "t2", "t3", redis.print)

client.lrange("transactions", 0, -1, redis.print)

client.rpop("transactions", redis.print)

// Queues = Push using LPUSH, extract using RPOP
// Stacks = Push using RPUSH, extract using RPOP

//** Keyspace Operations **

client.get("count", redis.print)
client.set("count", 1)
client.get("count", redis.print)


//** Hashmaps **
// {
//     "transactionId": "123",
//     "type": "PURCHASE",
//     "amount" 50
// }

client.hset("transaction:123", "transaction", 123,
    "type", "PURCHASE", "amount", 50, redis.print)

client.hgetall("transaction:123", redis.print)

client.hget("transaction:123", "amount", redis.print)

// SORTED SETS - leaderboards, ranking

client.zadd("scores", 940, "player1", redis.print)
client.zadd("scores", 950, "player2", redis.print)
client.zadd("scores", 930, "player3", redis.print)

player3, player1, player2

client.zrange("scores", 0, -1, redis.print)
client.zrevrange("scores", 0, -1, redis.print)