runReturn

// because I just needed the function to run once, then assign it - 
// I knew that I'd never need to run it manually again, so here I 
// extended the Function prototype :)

Function.prototype.runReturn = function (scope) {
  this.call(scope);
  return this;
};

// for example:
$(document).on('orientationchange', function () {
  $('body').removeClass('portrait landscape').addClass(window.innerWidth < window.innerHeight ? 'portrait' : 'landscape');
}.runReturn());