how to change values of input field on check box

I'm new to Jquery and i've been working on a checkout form. I've placed a check box " Shipping address different from billing address? " and upon checkbox checked the fields are set to empty using the following code.

$(document).on('change', '#ship_to_different_address', function() {
    if(this.checked) {
        $("#fname").val("");
        $("#lname").val("");
        $('#shipping_company').val("");

        this.checked = true;
    }else{

       //What to write here to fetch old values?

    }
});

I'm using Laravel framework. Please guide.

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