angular-ui-bootstrap-2.0/src/debounce/debounce.js

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angular.module('ui.bootstrap.debounce', [])
/**
 * A helper, internal service that debounces a function
 */
  .factory('$$debounce', ['$timeout', function($timeout) {
    return function(callback, debounceTime) {
      var timeoutPromise;

      return function() {
        var self = this;
        var args = Array.prototype.slice.call(arguments);
        if (timeoutPromise) {
          $timeout.cancel(timeoutPromise);
        }

        timeoutPromise = $timeout(function() {
          callback.apply(self, args);
        }, debounceTime);
      };
    };
  }]);