code: function _getPadding (source, char, len) {
      if (!isNil(source) && type(source) !== "String") {
          source = String(source);
      }
  
      return _repeat(String(char)[0] || "", Math.ceil(len - source.length));
  }
docs: Builds the prefix or suffix to be used when padding a string.
  @private
  @param {String} source
  @param {String} char
  @param {Number} len
  @returns {String}