A way around the JavaScript RegExp match null issue + Example of counting a letter in a string

gistfile1.js

//www.lsauer.com - lo sauer 2012
//description: JavaScript's match returns null when no matches are found. 
//             'null' has no Array methods resulting in error's should it be called directly
//#Example: count the occurance of 'o' in a string
//          (incidentally this should be the fasted method available of counting a letter in a string)
("this is foo".match(/o/g)||[]).length
//>2