Function createCaseFirst

test-app/public/sinon.js:15572–15590

* Creates a function like `_.lowerFirst`. * * @private * @param {string} methodName The name of the `String` case method to use. * @returns {Function} Returns the new case function.

(methodName)

         * @returns {Function} Returns the new case function.
         */
        function createCaseFirst(methodName) {
          return function(string) {
            string = toString(string);
    
            var strSymbols = hasUnicode(string)
              ? stringToArray(string)
              : undefined;
    
            var chr = strSymbols
              ? strSymbols[0]
              : string.charAt(0);
    
            var trailing = strSymbols
              ? castSlice(strSymbols, 1).join('')
              : string.slice(1);
    
            return chr[methodName]() + trailing;
          };
        }
    
        /**
         * Creates a function like `_.camelCase`.