[英]Find longest word in string - JavaScript
我目前正在使用python進行任務,我需要幫助,而且我需要幫助
編寫一個名為longest的函數,它將采用一串空格分隔的單詞並返回最長的單詞。
例如:
longest("This is Andela") => "Andela"
longest("A") => "A"
這是樣本測試
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, '');
});
});
});
這就是我嘗試過的
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;
}
但我的代碼似乎只傳遞了第一個測試用例。請考慮我是javascript的新手,我需要更改以傳遞其他兩個第一個案例
您需要在函數中刪除此行:
str = "This is Andela";
你的函數應該是(添加檢查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;
}
沒有數組且沒有每個語句的簡化代碼。
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'));
檢查一下:
function longest(s){
return typeof s != 'string' ? '' : s.split(' ').sort( (a,b) => b.length - a.length)[0]
}
輸入通過連接與空字符串轉換為字符串,以便在傳遞數字時也能正常工作。
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