async_conditioning with [async module](https://github.com/caolan/async)

async_conditioning2.js

var async = require('async');
var bools = {};
function check1(){
  // do something
  bools['check1'] = condition1;
}

function check2(){
  // do other things
  bools['check2'] = condition2;
}

async.parallel([check1, check2], function(err, results){
  var finalBool = true;
  for(var attr in bools){
    finalBool &= bools[attr];
  }
  if(finalBool){
    //all true
  }else{
    //at least one false
  }
});

async_conditioning3.js

var async = require('async');
function check1(callback){
  // do something
  callback(null, condition1);
}

function check2(callback){
  // do other things
  callback(null, condition2);
}

async.parallel([check1, check2], function(err, results){
  // results is always in the order of [condition1, condition2] no matter check1 or check2 finishes first
  var finalBool = true;
  results.forEach(function(result){
    finalBool &= result;
  });
  if(finalBool){
    //all true
  }else{
    //at least one false
  }
});