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    <p>Take a look at <a href="https://github.com/kriskowal/q" rel="nofollow">Q</a> for ways to flatten callbacks (the code would be little nicer). For your specific example, I would prefer to refactor using a number of methods:</p> <ol> <li>Return methods early when err (saves you from having to nest else's)</li> <li>Execute asynchronous calls concurrently when they're not dependent (notice DB.cityGet and DB.iBuildings.find - makes your code run faster as well)</li> <li>creating functions and referencing outside the nest (ex. checkComplete)</li> </ol> <p>My refactor below:</p> <pre><code> DB.cityUpdateUpkeep = function( cuid ){ /** @type {Array} */ var buildings = null; var city = null; var checkComplete = function(){ if (!city || !builings){ return; } var income = city.resources.income; var storage = city.resources.storage; var stored = city.resources.stored; for( var buildingID in buildings ){ var building = buildings[ buildingID ]; var blueprint = DB.bBuildings[ building.buid ]; if( blueprint.resources.income ){ income = Utils.sumObjects( income, blueprint.resources.income ); } if( blueprint.resources.storage ){ storage = Utils.sumObjects( storage, blueprint.resources.storage ); } if( blueprint.resources.stored ){ stored = Utils.sumObjects( stored, blueprint.resources.stored ); } } console.log( "cuid: " + city._id + " income: " + income + " storage " + storage + " stored " + stored ); } DB.cityGet(cuid, function(err, response){ if (err){ console.log("Couldn't get city"); return; } city = response; checkComplete(); }); DB.iBuildings.find({cuid:cuid}, function(err, cursor){ if (err){ console.log(err); return; } cursor.toArray(function(err, response){ if (err){ console.log(err) return; } buildings = response; checkComplete(); }); }); }); </code></pre>
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    1. COIt does, indeed look better. You still create checkComplete and the handlers each time you call cityUpdateUpkeep. Still, +1 for the paralleled calls. I had trouble figuring out the scope, but now that I see it, I feel silly how simple it is :))
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    2. COoops you are right about the checkComplete. Simply move that outside the function. The handlers should get cleaned up in modern javascript engines. In fact, from what I understand, the checkComplete also won't be reallocated each time - but best to be safe.
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