output

    $ NODE_PATH=/Users/brian/projects/redis-node-client/lib:$NODE_PATH node test-mget.js
    DEBUG: [ENQUEUE] Not connected. Request queued. There are 1 requests queued.
    DEBUG: [FLUSH QUEUE] 1 queued request buffers.
    DEBUG: [ENQUEUE] Not connected. Request queued. There are 2 requests queued.
    DEBUG: [FLUSH QUEUE] 2 queued request buffers.
    DEBUG: [ENQUEUE] Not connected. Request queued. There are 3 requests queued.
    DEBUG: [CONNECT]
    DEBUG: [FLUSH QUEUE] 3 queued request buffers.
    DEBUG: [DEQUEUE/SEND] *3<CRLF>$3<CRLF>set<CRLF>$3<CRLF>foo<CRLF>$3<CRLF>bar<CRLF>. queued buffers remaining = 2
    DEBUG: [DEQUEUE/SEND] *3<CRLF>$3<CRLF>set<CRLF>$3<CRLF>baz<CRLF>$3<CRLF>buz<CRLF>. queued buffers remaining = 1
    DEBUG: [RECV] +OK<CRLF>+OK<CRLF>
    DEBUG: [FLUSH QUEUE] 1 queued request buffers.
    DEBUG: [DEQUEUE/SEND] *3<CRLF>$4<CRLF>mget<CRLF>$3<CRLF>foo<CRLF>$3<CRLF>baz<CRLF>. queued buffers remaining = 0
    DEBUG: [RECV] *2<CRLF>$3<CRLF>bar<CRLF>$3<CRLF>buz<CRLF>

test-mget.js

var sys = require("sys"),
    assert = require("assert"),
    redis = require("redis-client");

redis.debugMode = true;

function showContext(context) {
    sys.error("\n");
    sys.log(context + " FAILED!");
    sys.error("");
}
function checkEqual(actual, expected, context) {
    try {
        assert.equal(actual, expected);
    } catch (e) {
        showContext(context);
        throw e;
    }
}
function expectOK(context) {
    return function (err, truthiness) {
        if (err) assert.fail(err, context);
        checkEqual(typeof(truthiness), 'boolean', context);
        checkEqual(truthiness, true, context);
    };
}
function testMGET() {
    client.set('foo', 'bar', expectOK("testMGET"));
    client.set('baz', 'buz', expectOK("testMGET"));

    client.mget('foo', 'baz', function (err, values) {
        if (err) assert.fail(err, "testMGET");
        checkEqual(values[0], 'bar', "testMGET");
        checkEqual(values[1], 'buz', "testMGET");
      
        process.exit(0);
    });
}

var client = redis.createClient();
testMGET();

Try changing line 31 to client.mget(['foo', 'baz'], function (err, values) {

Well, that doesn't work because that's not the API.

I suggest that if you have an array that you push the callback function onto it and then use client.mget.apply(client, the_aforementioned_array).

client.mget.apply(client, ['foo', 'baz', function (err, values) {
    if (err) assert.fail(err, "testMGET");
    checkEqual(values[0], 'bar', "testMGET");
    checkEqual(values[1], 'buz', "testMGET");

    process.exit(0);
}]);