Nowadays, there is a simple way to do this : Object.values().
var myObj = {
1: [1, 2, 3],
2: [4, 5, 6]
};
console.log(Object.values(myObj));
Output:
[[1, 2, 3], [4, 5, 6]]
This doesn't required jQuery, it's been defined in ECMAScript 2017.
It's supported by every modern browser (forget IE).