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

.

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Tags
String
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/**
* @param {string} s
* @return {number}
*/
var lengthOfLastWord = function (s) {
s = s.trim();
if (s.length === 0) {
return 0;
}

var arr = s.split(' ');
return arr[arr.length - 1].length;
};