如何优化这种复数文本功能？

Question

我想复数字符串。我编写了可以接受单个字符串或字符串数​​组的函数，并返回复数字符串。

pluralizeTextArray: function(strArray) {
    var isNotArray = !_.isArray(strArray),
        temp = [];
    if (isNotArray) {
        temp[0] = strArray;
        strArray = temp;
    }
    var length = strArray.length,
        pluralizedArr = [],
        vowels = ['a','e','i','o','u'],
        lastChar = "",
        suffix = "s",
        str = "";

        for (var i = 0; i < length; i++) {
            str = strArray[i];
            lastChar = str[str.length - 1];
            switch (lastChar) {
                case 's':
                    if (!str.endsWith('ies')) {
                        suffix = 'es';
                    }
                    break;
                case 'y':
                    //ends in [consonant]y - add ies
                    //ends in [vowel]y - add 's' , 
                    //exception string ending with 'quy'
                    if ($.inArray(str[str.length - 2], vowels) === -1 ||
                       strObj.endsWith('quy')) {
                        str = str = _.initial(str).join(""); //removed last character
                         suffix = 'ies';
                    }
                    break;
                }
                pluralizedArr[i] = str+suffix;
            }
            retrun isNotArray ? pluralizedArr[0] : pluralizedArr;
        }

如果输入不是数组，我必须创建一个，我认为这是错误的。这段代码可以优化吗？