code: function pickPrefix(prefix, object) {
      var length = prefix.length;
      var sub;
      return foldl(
        function(acc, val, key) {
          if (key.substr(0, length) === prefix) {
            sub = key.substr(length);
            acc[sub] = val;
          }
          return acc;
        },
        {},
        object
      );
    }
docs: Create a shallow copy of an input object containing only the properties
  whose keys are specified by a prefix, stripped of that prefix
  
  @param {String} prefix
  @param {Object} object
  @return {Object}
  @api private