Question

我目前正在使用python进行任务，我需要帮助，我是

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;
}

但是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，我需要更改以传递另外两个案例

Answer 1

您需要在函数中删除此行：

str = "This is Andela";

你的功能应该是（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;
}

Answer 2

没有数组且没有每个语句的简化代码。

function longer(champ, contender) {
  return (contender.length > champ.length) ? contender: champ;
}

function longestWord(str) {
    var words = str.split(' ');
    return words.reduce(longer);
}
console.log(longestWord('This is longest'));
console.log(longestWord('This is longest or may this is more longestest'));

Answer 3

检查一下：

function longest(s){
    return typeof s != 'string' ? '' : s.split(' ').sort( (a,b) => b.length - a.length)[0]
}

通过串联将输入转换为字符串，并使用空字符串，以便在传递数字时也能正常工作。

查找字符串中最长的单词 - JavaScript

3 个答案: