Waiting for multiple callbacks in Node.js

You could also do it using when and promises, which IMHO is the easiest to read.

var promises = [];if(x) {    var deferred1 = when.defer();    doSomethingAsync({ callback: deferred1.resolve });    promises.push(deferred1.promise);} else if(y) {    var deferred2 = when.defer();    doSomethingAsync({ callback: deferred2.resolve });    promises.push(deferred2.promise);} else if(z) {    var deferred3 = when.defer();    doSomethingAsync({ callback: deferred3.resolve });    promises.push(deferred3.promise);}when.all(promises).then(function () {    console.log('Finished Promises');});

Here's one way with async series.

https://github.com/caolan/async#series

async.series([    function(callback){        if(foo === bar){            function1(arg1, function(val1){                callback(null, val1);            });        }else if(foo === baz){            function2(arg2, function(val2){                 callback(null, val2);            });        }else{            function3(arg3, function(val3){                 callback(null, val3);            });        }    }  ], function(error, valArray){       doWhatever(valArray[0], function(){           res.end("Finished");       });});

Here's using wait.for

https://github.com/luciotato/waitfor

//in a fibervar result;if(foo === bar){    result = wait.for(function1,arg1);}else if(foo === baz){    result = wait.for(function2,arg2);}else{    result = wait.for(function3,arg3);};doWhatever(result, function(){        res.end("Finished");});

You need to be in a fiber (or generator) to use wait.for, but, if you have a lot of callback hell,wait.for is a good approach.