debounce.js

// Original by John Hann
// http://unscriptable.com/2009/03/20/debouncing-javascript-methods/
function debounce( fn, threshold ) {
  var timeout;
  
  return function debounced() {
    var _this = this;
    var args = arguments;
    
    if ( timeout ) {
      clearTimeout( timeout );
    }

    timeout = setTimeout( function delayed() {
      fn.apply( _this, args );
      timeout = null;
    }, threshold || 100 );
  }
}