gistfile1.js

function makecola(name, calories, color, sold) {
  name = name || "Water";
  calories = calories || 0;
  color = color || "clear";
  sold = sold || 0;
  return {
    name: name,
    calories: calories,
    color: color,
    sold: sold
  };
}

var products = [
makecola("Grapefruit", 170, "red", 8200),
makecola("Orange", 160, "orange", 12101),
makecola("Cola", 210, "caramel", 25412),
makecola("Diet Cola", 0, "caramel", 43922),
makecola("Lemon", 200, "green", 14983),
makecola("Raspberry", 180, "pink", 9427),
makecola("Root Beer", 200, "caramel", 9909),
makecola(false, false, false, 62123)
];

function printProducts() {
  var labels = (arguments.length === 0) ? ["name"] : arguments;
  for(var i=0; i<products.length; i++) {
    var product = products[i];
    var info = "";
    for(var j=0; j<labels.length; j++) {
      var label = labels[j];
      info += label + ": " + product[label] + " ";
    }
    console.log(info);
  }
}

function compareLabel(colaA, colaB, test, label) {
  if(test(colaA[label], colaB[label]))
    return 1;
  else
    return -1;
}

function makeCompareFunction(label) {
  return function(colaA, colaB) {
    return compareLabel(colaA, colaB, function(a, b) { return a < b; },
        label);
  };
}

/*
function compareSold(colaA, colaB) {
  return compareLabel(colaA, colaB, function(a, b) { return a < b; },
      "sold");
}

function compareName(colaA, colaB) {
  return compareLabel(colaA, colaB, function(a, b) { return a < b; },
      "name");
}
function compareCalories(colaA, colaB) {
  return compareLabel(colaA, colaB, function(a, b) { return a < b; },
      "calories");
}
function compareColor(colaA, colaB) {
  return compareLabel(colaA, colaB, function(a, b) { return a < b; },
      "color");
}
*/

var compareSold = makeCompareFunction("sold");

printProducts("name");

console.log("\nAfter sorting sold:");
products.sort(compareSold);
printProducts("name", "sold");
//printProducts();