ioredis basic_operations

const Redis = require("ioredis"); const redis = new Redis({ port: process.env.redisPort, host: process.env.redisEndpoint, password: process.env.redisPW }); // ioredis supports all Redis commands: redis.set("foo", "bar"); // returns promise which resolves to string, "OK" // the format is: redis[SOME_REDIS_COMMAND_IN_LOWERCASE](ARGUMENTS_ARE_JOINED_INTO_COMMAND_STRING) // the js: ` redis.set("mykey", "Hello") ` is equivalent to the cli: ` redis> SET mykey "Hello" ` // ioredis supports the node.js callback style redis.get("foo", function(err, result) { if (err) { console.error(err); } else { console.log(result); // Promise resolves to "bar" } }); redis.del("foo"); // Or ioredis returns a promise if the last argument isn't a function redis.get("foo").then(function(result) { console.log(result); }); // Arguments to commands are flattened, so the following are the same: redis.sadd("set", 1, 3, 5, 7); redis.sadd("set", [1, 3, 5, 7]); redis.spop("set"); // Promise resolves to "5" or another item in the set // Most responses are strings, or arrays of strings redis.zadd("sortedSet", 1, "one", 2, "dos", 4, "quatro", 3, "three") redis.zrange("sortedSet", 0, 2, "WITHSCORES").then(res => console.log(res)); // Promise resolves to ["one", "1", "dos", "2", "three", "3"] as if the command was ` redis> ZRANGE sortedSet 0 2 WITHSCORES ` // Some responses have transformers to JS values redis.hset("myhash", "field1", "Hello"); redis.hgetall("myhash").then(res => console.log(res)); // Promise resolves to Object {field1: "Hello"} rather than a string, or array of strings // All arguments are passed directly to the redis server: redis.set("key", 100, "EX", 10); // Change the server configuration redis.config("set", "notify-keyspace-events", "KEA");