查找数组中最长的字符串(即使它是一个数字数组)

Finding longest string in an array (even if it's an array of numbers)

本文关键字：数组 一个 数字 查找 字符串      更新时间：2023-09-26

当我运行这个时:

var array= [123, ["hello", 67, 888888], "try", {key: "key", value: "this is the longest String"}]
longestString(array);
correct answer:
>>>"this is the longest String" 
current answer:
>>>"try"

如何更新此函数以通过上述测试并返回正确答案?

下面是longestString()函数:

function longestString(array) {
    // return the longest string in the array
    var longest = 0;
    var longestString = "";
    for (var i = 0; i < array.length; i++) {
        if (array[i].length > longest && typeof array[i] =="string") {
        longest = array[i].length;
        longestString = array[i];
        }
    }
    return longestString;
}

添加typeof来检查数据是否为字符串

这样的

function longestString(array) {
    // return the longest string in the array
    var longest = 0;
    var longestString = "";
    for (var i = 0; i < array.length; i++) {
        if (array[i].length > longest && typeof array[i] ==="string") {
        longest = array[i].length;
        longestString = array[i];
        }
    }
    return longestString;
}

编辑

在嵌套数组/对象中的字符串?

试试这样

function longestString(array) {
    // return the longest string in the array
    var longest = 0;
    var longestString = "";
    for (var i = 0; i < array.length; i++) {
        if (Object.prototype.toString.call(array[i]) === '[object Array]') {
            array[i].forEach(function (it) {
                if (it.length > longest) {
                    longest = it.length;
                    longestString = it;
                }
            })
        } else if (Object.prototype.toString.call(array[i]) === '[object Object]') {
            for (var j in array[i]) {
                if (array[i][j].length > longest) {
                    longest = array[i][j].length;
                    longestString = array[i][j];
                }
            }
        } else if (typeof array[i] == "string" && array[i].length > longest) {
            longest = array[i].length;
            longestString = array[i];
        }
    }
    return longestString;
}
console.log(longestString([123, ["hello", 67, 888888], "try", {
    key: "key",
    value: "this is the longest String"
}]));
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