查找字符串中最长的单词 - JavaScript [英] Find longest word in string - JavaScript
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问题描述
我目前正在用 python 执行一项任务,我需要这方面的帮助,我将
I am currently on a task in python and i need help with this and i am to
编写一个名为longest的函数,它将接受一串空格分隔的单词并返回最长的单词.
Write a function called longest which will take a string of space separated words and will return the longest one.
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;
}
但我的代码似乎只通过了第一个测试用例.考虑到我是 javascript 新手,我需要更改什么才能通过其他两个第一个用例
But my code seem to only pass the first test case.Please what do i need to change to pass the other two first case considering i am new to javascript
推荐答案
你需要在你的函数中删除这一行:
You need to remove this line in your function:
str = "This is Andela";
您的函数应该是(添加检查 str 是否为字符串):
You function should be (added check if str is string):
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;
}
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