loop in node.js should use recursive or async (node-async) but if you use total.js framework, async feature already exist and this is the comparation of using non-node.js programmer's loop to better approach

async loop

	rc.zrange(['cust', '0', '-1'], function(err, data) {

	    if (err) {
	        rc.quit();
	        self.throw500(err);
	        return;
	    }

	    var length = data.length;

	    if (data.length === 0) {
	        self.json(result);
	        return;
	    }

	    // Create array
	    var arr = [];

	    for (var i = 0; i < length; i++)
	        arr.push('cust:' + data[i]);        

	    var fn_async = function(item, next) {        
	        rc.hgetall(item, function(err, datacust) {

	            if (err) {
	                rc.quit();
	                self.throw500(err);
	                return;
	            }

	            if (datacust)
	                datacust.id = data[result.length];

	            result.push(datacust);
	            next();
	        });
	    };

	    var fn_complete = function() {
	        rc.quit();
	        self.json(result);
	    };
	    console.log(1);
	    // Walk through the array (async)
	    arr.wait(fn_async, fn_complete);        

	});

not good loop style in node.js (not safe)

	var objrows = [];
	rc.zrange(['cust','0','-1'],function(err,data){
		if (err){throw err; rc.quit();return;}
		dl=data.length;
		if(dl&&dl>0){
			for (var i = 0,imax = dl; i < imax; i++) {
				rc.hgetall('cust:'+data[i],function(err,datacust){
					if (err){throw err; rc.quit();return;}
					objrows.push(datacust);
					showoff();
				});					
			};
		}
	});
	function showoff(){
		if(objrows.length==dl){
			rc.quit();
			self.json(objrows);
		}		
	}