557. Reverse Words in a String III 反轉字串裡的單字

❀ Origin

Problem

Given a string,
you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.

Note

In the string, each word is separated by single space and there will not be any extra space in the string.

Example

1 2	Input: "Let's take LeetCode contest" Output: "s'teL ekat edoCteeL tsetnoc"

❀ 翻譯

問題

給定一個字串,
你必須倒轉每個單字裡的字母的順序, 同時保留空格和原始句子的順單字順序.

注意

在字串裡, 每個單字都會用一個空白來隔開, 而且單字裡不會存在額外的空白.

❀ Solution

JavaScript

/**
 * @param {string} s
 * @return {string}
 */

// 依題意,
// 先將字串 s 拆分成陣列,
// 再用 .map() 對每個 word 做倒轉處理,
// 之後再 join 成字串.

var reverseWords = function(s) {
	return s
		.split(' ')
		.map(function(item, index) {
			return reverseString(item);
		})
		.join(' ');
};
//參考： https://github.com/xTobu/LeetCode/tree/master/JavaScript/%23344
var reverseString = function(s) {
	return s.split('').reverse().join('')
};

console.log(reverseWords("Let's take LeetCode contest"));