Array Detection

is_array.js

/*
    Since using the typeof operator to test an array returns 'object'
    we need another way to test it.
    ( via http://jqfundamentals.com/book/book.html#N20659 )
*/
var is_array = function (my_array) {
    if (Object.prototype.toString.call(my_array) === '[object Array]') {
        return true;
    }
    return false;
};

This is now built in to the language: Array.isArray(my_array)