Comparator function

gistfile1.js

/*
  Ridiculously useful function
  Sorts elements of an array by properties

  Usage:
    Sort elements by property prop1, then by prop2 if prop1 values are equal
    someArrayOfObjects.sort(comparator('prop1', 'prop2'));
*/

function comparator(){
  var props = [].slice.call(arguments);
  return function(a, b){
    var p = props.slice(0), prop;
    while(prop = p.shift()){
      if(a[prop] < b[prop]) return -1;
      if(a[prop] > b[prop]) return 1;
    }
    return 0;
  };
}