Sorting Object by sub-object property

Question

I have an object of objects, which I\'d like to sort by property... having some trouble wrapping my head around it:

sample = {
    \"Elem1\": { title: \"Deve         


        

Answer 1

Properties (keys) of an object are not intrinsically ordered; you must maintain your own array of their ordering if you wish to do so.

Here is an example of how you could simplify ordering your sample object by arbitrary properties via custom sort functions:

var orderKeys = function(o, f) {
  var os=[], ks=[], i;
  for (i in o) {
    os.push([i, o[i]]);
  }
  os.sort(function(a,b){return f(a[1],b[1]);});
  for (i=0; i ["Elem4", "Elem2", "Elem1", "Elem3"]

orderKeys(sample, function(a, b) {
  return a.title.localeCompare(b.title);
}); // => ["Elem2", "Elem1", "Elem4", "Elem3"]

Once the properties are ordered as you like then you can iterate them and retrieve the corresponding values in order.