code: function(callback) {
        var found = [];
        this.each(function(key, value) {
          if (callback(key, value)) {
            found.push([key, value]);
          }
          return true;
        });
        return found;
      }
docs: Filters the store by a filter function that takes a key value. Returns an array of arrays where the first element of each array is the key and the second is the value of that key.  ### Example  var store = new Sammy.Store; store.set('one', 'two'); store.set('two', 'three'); store.set('1', 'two'); var returned = store.filter(function(key, value) { // only return return value === 'two'; }); // returned => [['one', 'two'], ['1', 'two']];