count.js

function count (mixed_var, mode) {
  // http://kevin.vanzonneveld.net
  // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +      input by: Waldo Malqui Silva
  // +   bugfixed by: Soren Hansen
  // +      input by: merabi
  // +   improved by: Brett Zamir (http://brett-zamir.me)
  // +   bugfixed by: Olivier Louvignes (http://mg-crea.com/)
  // *     example 1: count([[0,0],[0,-4]], 'COUNT_RECURSIVE');
  // *     returns 1: 6
  // *     example 2: count({'one' : [1,2,3,4,5]}, 'COUNT_RECURSIVE');
  // *     returns 2: 6
  var key, cnt = 0;

  if (mixed_var === null || typeof mixed_var === 'undefined') {
    return 0;
  } else if (mixed_var.constructor !== Array && mixed_var.constructor !== Object) {
    return 1;
  }

  if (mode === 'COUNT_RECURSIVE') {
    mode = 1;
  }
  if (mode != 1) {
    mode = 0;
  }

  for (key in mixed_var) {
    if (mixed_var.hasOwnProperty(key)) {
      cnt++;
      if (mode == 1 && mixed_var[key] && (mixed_var[key].constructor === Array || mixed_var[key].constructor === Object)) {
        cnt += this.count(mixed_var[key], 1);
      }
    }
  }

  return cnt;
}