code: function createCaseFirst(methodName) {
          return function (string) {
            string = toString(string);
            var strSymbols = reHasComplexSymbol.test(string) ? stringToArray(string) : undefined;
            var chr = strSymbols ? strSymbols[0] : string.charAt(0), trailing = strSymbols ? strSymbols.slice(1).join('') : string.slice(1);
            return chr[methodName]() + trailing;
          };
        }
docs: Creates a function like `_.lowerFirst`.
  
  @private
  @param {string} methodName The name of the `String` case method to use.
  @returns {Function} Returns the new function.