array concat apply

loopYourConcatApplier.js

// Want to control subsort of each container, but push the results sequentially 
//    by container on resultsArray
// Otherwise if you just .push like normal on resultsArray, you'll clobber
//    at the top of whatever looping construct you use.
var i, j, resultsArray = [];
var subArray1First = true;
var sourceArrays = [
  container1 = {
    subArray1: [a, b, c],
    subArray2: [d, e, f]
  },
  container2 = {
    subArray1: [g, h, i],
    subArray2: [ [k, l, m], [n, o, p] ]
  }
];

for (i = 0; i < sourceArrays.length; i++) {
  container = sourceArrays[i];
  
  // It gets a little lengthly when using concat instead of push, but this way you can do it all in one call.
  if (subArray1first) {
    resultsArray = resultsArray.concat.apply(resultsArray, container.subArray1, container.subArray2);
  } else {
    resultsArray = resultsArray.concat.apply(resultsArray, container.subArray2, container.subArray1);
  }
}