gistfile1.js

var array = [];
var instance = $(this);
 
 array.push(getAnArrayItem(instance.val(), "1", "123.89")); //pass  the values  either by using harcode d values or from a input...



// function to use to get an item to push

var getAnArrayItem = function(product, quantity, price){ //parameters to construct an item
var item = null;
	if(product && quantity && price) //these can be  based on you requirements as some propeties is not mandatory
	{
		item = {
			product: product,
			quantity: quantity,
			price: price
		};
	}

return  item;
}