Array.sort() method change my object before it called, mutability issue?

Question

I think there is a notion that I do not understand well, namely the notion of mutability.

Here is my code:

console.log(inputs); // Already sorted (?!)
// sort the array
inputs.sort(function(a, b) {
    return a.order - b.order;
});

Only thing is, my console.log shows me the array inputs already sorted, while the .sort() method only applies afterwards.

I think it's a mutability problem, I just don't quite understand the scope of it. Why my console.log print the array already sorted ?

Thanks in advance