Sometimes I wish events worked like this. Normal event listeners: "when X happens do Y" Reversed events listeners: "do Y when X happens".

reverse-events.js

Function.prototype.on = function( scope, eventName, useCapture ) {
  scope.addEventListener( eventName, this, useCapture );
};

Function.prototype.off = function( scope, eventName, useCapture ) {
  scope.removeEventListener( eventName, this, useCapture );
};

// Sample listener
function doSomething() { console.log( 'Doing it.' ); }

// Call doSomething when the window resizes
doSomething.on( window, 'reisze' );

// Kill the listener
doSomething.off( window, 'reisze' );