Receiving reply from Redis ZRANGE - node.js

Question

I currently have two sorted sets and I am trying to get all scores and members from one set and use it to remove members from the other set. The module that I am using is node_redis.
Right now I am trying to get the members and scores by calling client.zrange() and storing the reply in an array.
Am I correct in assuming the reply would be in array form? I realize the redis api says it returns a "Multi-bulk reply" but what does that mean exactly and how would I go about using it if it isn't an array?
I also have another question and that is can I use an array when using zadd()?
An example would be like this.
client.zadd(historyKey, scores, members, function(err, reply){});
Where scores and members are arrays.
EDIT:
I am working with receiving and parsing SNMP Traps. Basically I receive a trap and check its alarm type. The useful information in these traps are the alarm type and the full trap name. I check to see if the alarm is a 0,1, or 2.
If it's a 1, then I store it in my Current sorted set at the unix time I received it. If it's a 0 or 2 I know that type of alarm is done and that I need to remove all traps like it from the Current set and put them into the History set along with the one I just received.
In order to remove the traps from the Current and put them into the History I had to create a separate set for each individual trap in order to keep track of where they would be located in the Current set.
That is if I receive the trap "RGB Gamut Error( ----Bb )" at time 1346276537 and store it in Current, I also store the exact score and member in a separate set with key "IPAddress:RGB Gamut Error".
That way when I receive alarm type 0 or 2 with the name "RGB Gamut Error" I can just append the IP Address to the front of it, go do zrange on that set, then add to History and remove from Current. And lastly delete the "IPAddress:RGB Gamut Error" set so I can start fresh.
Sidenote: My members actually have two numbers added to the end in order to make each member unique and not overwrite each other. This is really there only purpose.
Ex: IPAdress::RGB Gamut Error( Rr--Bb ):5:46

Answer 1

Am I correct in assuming the reply would be in array form?
Yes, node_redis will give you the reply from a zrange as an array.
I also have another question and that is can I use an array when using zadd()? An example would be like this.
No. Before redis 2.4, you could only send one parameter at a time (so zadd key score member). Since redis 2.4, zadd (and many other commands) are variadic, i.e. they accept any number of parameters -- but not as an array. You still have to call it like this:
client.zadd(key, score1, member1, score2, member2, ..., function(err, reply){});
You could do some .apply trickery, but you would have to zip the scores and members arrays into one array first.
Update:
If you already have scores and members arrays, you could merge them into one array like this:
var scores = [1, 2, 3],
members = ['a', 'b', 'c'];
function merge (other) {
return function (result, current, index) {
result.push(current, other[index]);
return result;
}
}
var merged = scores.reduce(merge(members), []);
// Now merged = [1, 'a', 2, 'b', 3, 'c'];
var args = [key].concat(merged).concat(function(err, reply){});
client.zadd.apply(client, args);