First Word Retrieval from a sentence

Hi,
I want to display only the first word in a sentence.Please let me know how can I do this by using Javascript.
Thanks in advance.

 

var s="This is a sentence";
var first_word=s.split(" ")[0];

 

Maybe you should trim the sentence first so you won't hit a problem if the string starts with spaces :

var s="This is a sentence";
s= s.replace(/^\s\s*/, '').replace(/\s\s*$/, '');
var first_word=s.split(" ")[0];