Fibonacci number script

fibonacci.js

var Fibonacci = function () {
    //private
    var nums = [0,1];
    
    return {
        pushNumbers: function (q) {
            //check if value pass to this method is a number
            //if not set it to 0
            q = typeof q === 'number' ? q : 0;
            
            for (var i = 0; i < q; i ++) {
                //get actual size and calc next number to push in array
                var actSize = nums.length - 1,
                    next = nums[actSize] + nums[actSize - 1];
                nums.push(next);
            }
        },
        
        getSeq: function () {
            return nums;
        }
    };
};