(function() {
  var __slice = [].slice,
    __hasProp = {}.hasOwnProperty;

  this.extend = function() {
    var destination, k, source, sources, v, _i, _len;

    destination = arguments[0], sources = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
    for (_i = 0, _len = sources.length; _i < _len; _i++) {
      source = sources[_i];
      for (k in source) {
        v = source[k];
        destination[k] = v;
      }
    }
    return destination;
  };

  this.is_empty = function(obj) {
    var key;

    if (Array.isArray(obj) || typeof obj === 'string') {
      return obj.length === 0;
    }
    for (key in obj) {
      if (!__hasProp.call(obj, key)) continue;
      return false;
    }
    return true;
  };

}).call(this);