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---
id: ab6137d4e35944e21037b769
title: 句中單詞首字母大寫
challengeType: 5
forumTopicId: 16088
dashedName: title-case-a-sentence
---
# --description--
請將傳入的字符串中,每個單詞的第一個字母變成大寫並返回。 注意除首字母外,其餘的字符都應是小寫的。
在這個挑戰中,我們還需要將諸如 `the``of` 之類的連接詞大寫。
# --hints--
`titleCase("I'm a little tea pot")` 應返回一個字符串。
```js
assert(typeof titleCase("I'm a little tea pot") === 'string');
```
`titleCase("I'm a little tea pot")` 應返回 `I'm A Little Tea Pot`
```js
assert(titleCase("I'm a little tea pot") === "I'm A Little Tea Pot");
```
`titleCase("sHoRt AnD sToUt")` 應返回 `Short And Stout`
```js
assert(titleCase('sHoRt AnD sToUt') === 'Short And Stout');
```
`titleCase("HERE IS MY HANDLE HERE IS MY SPOUT")` 應返回 `Here Is My Handle Here Is My Spout`
```js
assert(
titleCase('HERE IS MY HANDLE HERE IS MY SPOUT') ===
'Here Is My Handle Here Is My Spout'
);
```
# --seed--
## --seed-contents--
```js
function titleCase(str) {
return str;
}
titleCase("I'm a little tea pot");
```
# --solutions--
```js
function titleCase(str) {
return str.split(' ').map(word => word.charAt(0).toUpperCase() + word.substring(1).toLowerCase()).join(' ');
}
titleCase("I'm a little tea pot");
```