[LeetCode][JavaScript]Length of Last Word

Length of Last Word

Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string.

If the last word does not exist, return 0.

Note: A word is defined as a character sequence consists of non-space characters only.

For example, 
Given s = "Hello World",
return 5.

https://leetcode.com/problems/length-of-last-word/

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求最后一个单词的长度。

js split方法可以传正则表达式作为参数，处理这题就很方便。

/**
 * @param {string} s
 * @return {number}
 */
var lengthOfLastWord = function(s) {
    var splitArr = s.trim().split(/ +/);
    return splitArr ? splitArr[splitArr.length - 1].length : 0;
};