Sample implementation of the browser window resize observer that throttles native browser events and emits custom events instead. This might be useful if you don't need to respond to resize events immediately and performance is a major concern.

WindowResizeManager.js

WindowResizeManager = function( debounceWait ) {
  this.debounceWait = debounceWait || 200;
  _.bindAll(this, "handleWindowResizeEvent", "triggerWindowResizeCompleteEvent");
  this.cacheDom();
  this.bindWindowResizeEvent();
};

WindowResizeManager.prototype.cacheDom = function() {
  this.window: $(window);
};

WindowResizeManager.prototype.bindWindowResizeEvent = function() {
  var handler = this.handleWindowResizeEvent();
  this.window.on( "resize orientationchange", handler );
};

WindowResizeManager.prototype.handleWindowResizeEvent = function() {
  return _.debounce( this.triggerWindowResizeCompleteEvent, this.debounceWait );
};

WindowResizeManager.prototype.triggerWindowResizeCompleteEvent = function() {
  this.window.trigger( "resizeCompleted.window" );
};

The code implicitly depends on Underscore (debounce method) and jQuery and this could certainly be improved.