题目
难度：easy
Given a List of words, return the words that can be typed using letters of alphabet on only one row's of American keyboard like the image below.
keyboard.png
Example 1:
Input: ["Hello", "Alaska", "Dad", "Peace"]
Output: ["Alaska", "Dad"]
Note:
You may use one character in the keyboard more than once.
You may assume the input string will only contain letters of alphabet.
第一次解法
/**
* @param {string[]} words
* @return {string[]}
*/
var findWords = function(words) {
let row1 = new Set('qwertyuiopQWERTYUIOP');
let row2 = new Set('asdfghjklASDFGHJKL');
let row3 = new Set('zxcvbnmZXCVBNM');
let isSameRow = function(letters, row) {
return letters.every(letter => row.has(letter));
}
return words.filter((word) => {
let letters = word.split('');
return isSameRow(letters, row1) || isSameRow(letters, row2) || isSameRow(letters, row3);
});
};# runtime : 99ms
