The following code save the whole array as single value in redis list. But I want to save array values individually. How can I do it?
P.S So sorry for poor English.
var redis = require('redis'),
client = redis.createClient();
var arr = [1,2,3];
client.rpush('testlist',arr);
Use multi() to pipeline multiple commands at once:
var redis = require('redis'),
client = redis.createClient();
var arr = [1,2,3];
var multi = client.multi()
for (var i=0; i<arr.length; i++) {
multi.rpush('testlist', arr[i]);
}
multi.exec(function(errors, results) {
})
And finally call exec() to send the commands to redis.
Even if @gimenete answer works, the best way to do what you want is to forward the list elements as arguments to rpush like so:
var redis = require('redis'),
client = redis.createClient();
var arr = [1,2,3];
client.rpush.apply(client, ['testlist'].concat(arr));
// ... or with a callback
client.rpush.apply(client, ['testlist'].concat(arr).concat(function(err, ok){
console.log(err, ok);
}));
Pros: - a single instruction will be transmited to Redis
Cons:
- a corner-case: .apply will throw a RangeError: Maximum call stack size exceeded if the arguments list length passed to rpush is too large (a little over 100 000 items for v8).
From MDC:
The consequences of applying a function with too many arguments (think more than tens of thousands of arguments) vary across engines (JavaScriptCore has hard-coded argument limit of 65536), because the limit (indeed even the nature of any excessively-large-stack behavior) is unspecified. Some engines will throw an exception. More perniciously, others will arbitrarily limit the number of arguments actually passed to the applied function.
Error: ERR wrong number of arguments for 'rpush' command.RPUSH with multiple value.import { createClient } from "redis";
const redisClient = createClient();
const arr = [1, 2, 3];
async function cacheList() {
await Promise.all(arr.map((elem) => redisClient.rPush("testlist", elem)));
}
forloop or useArray.prototype.forEach.