Length of Last Word

Feb 05, 2018

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.

Example:
Input: “Hello World”
Output: 5

Solution:

var lengthOfLastWord = function(s) {
    var i = s.length;
    while(s.charAt(i-1) !== ' ' && i > 0 ) {
        i--;
    }
     return s.length - i;
};