Client scripting: disable options from a dropdown

(courtesy of ServiceNow Guru:
https://www.servicenowguru.com/scripting/client-scripts-scripting/removing-disabling-choice-list-options/
)

//--remove the state options from the dropdown

    var control = g_form.getControl('state');

    var options = control.options;

    for (var i = 0; i < options.length; i++) {

        var option = options[i];

        var ov=option.value;

       

        if (ov!='-24') {

            control.options[i].disabled = 'true';

        }

       

    }