查找字符串中最长的单词 - JavaScript

Question

我目前正在使用python进行任务,我需要帮助,而且我需要帮助

编写一个名为longest的函数,它将采用一串空格分隔的单词并返回最长的单词.

例如:

longest("This is Andela") => "Andela"
longest("A") => "A"

这是样本测试

const assert = require("chai").assert;

describe("Module 10 - Algorithyms", () => {
describe("longest('This Is Andela')", () => {
    let result = longest("This Is Andela");
    it("Should return 'Andela'", () => {
        assert.equal(result, 'Andela');
    });
});

describe("longest('This')", () => {
    let result = longest("This");
    it("Should return 'This'", () => {
        assert.equal(result, 'This');
    });
});

describe("longest(23)", () => {
    let result = longest(23);
    it("Should return ''", () => {
        assert.equal(result, '');
    });
});
});

这就是我尝试过的

function longest(str) {
str = "This is Andela";
var words = str.split(' ');
var longest = '';

for (var i = 0; i < words.length; i++) {
  if (words[i].length > longest.length) {
    longest = words[i];
  }
}
return longest;
}

但我的代码似乎只传递了第一个测试用例.请考虑我是javascript的新手,我需要更改以传递其他两个第一个案例

Answer 1

您需要在函数中删除此行:

str = "This is Andela";

你的函数应该是(添加检查str是否是字符串):

function longest(str) {
    if(typeof str !== 'string') return '';
    var words = str.split(' ');
    var longest = '';

    for (var i = 0; i < words.length; i++) {
      if (words[i].length > longest.length) {
        longest = words[i];
      }
    }
    return longest;
}