BR - Script does not execute "DOES NOT CONTAIN"

[Manikandan Subr]

Hi, i have an issue in the below condition. 

In Incident table there is a list field = u_customers and in the Change request table there is = u_customers_impacted list column.

I want to compare if the list of customers in Incident table is available in Change request customer list and what are found i want to remove them from the incident list. From the below script, what ever is found is getting updated but when i use for updating only not found values, it is updating multiple times the same found value.

if (cust_arr_inc[i].indexOf(cust_arr_cr[j])>= 0)  - this condition is updating the found values

but i want to do something like if (cust_arr_inc[i].indexOf(cust_arr_cr[j])<= 0) to update only not found values and it is repeating the customer names multiple times. Below is the complete script - please suggest. 

var cust_found_arr = [];
var match = false;
var i = 0;
var j = 0;
var gr = new GlideRecord('incident');
gr.addQuery('number', 'INC0170752');
gr.query();
while (gr.next()) {
    var changeReq = new GlideRecord('change_request');
    changeReq.addQuery('cmdb_ci', gr.cmdb_ci);
    changeReq.query();
    while (changeReq.next()) {
        gs.print('the CR numbers matched is ' + changeReq.number);
        var cust_arr_inc = [];
        cust_arr_inc = gr.u_customers.toString().split(',');
        gs.print('the Inc customers are ' + cust_arr_inc + gr.number);

        var cust_arr_cr = [];
        cust_arr_cr = changeReq.u_customers_impacted.toString().split(',');
        gs.print('the CR customers are ' + cust_arr_cr + gr.number);

        for (i = 0; i < cust_arr_inc.length; i++) {
            for (j = 0; j < cust_arr_cr.length; j++) {
                if (cust_arr_inc[i].indexOf(cust_arr_cr[j]) >= 0) {
                    cust_found_arr.push(cust_arr_inc[i]);
                    gs.print('The matched Companies are :' + cust_found_arr + ' - ' + gr.number);

                }

            }

        }
    }
}

if (cust_found_arr[0].length > 0) {
    gr.setValue('u_customers', '');
    gr.setValue('u_customers', cust_found_arr.toString());
    gs.print('The Final Customer names are ' + gr.u_customers);
}

[vkachineni]

//Try

if (cust_found_arr.length > 0) {
gr.setValue('u_customers', '');
gr.setValue('u_customers', cust_found_arr.toString());
gs.print('The Final Customer names are ' + gr.u_customers);
}

[vkachineni]

You can use ArrayUtil

var arrayUtil = new ArrayUtil();
var a1 = new Array("a", "b", "c"); //your full companies list on incident
var a2 = new Array("c"); //your companies found on CR 
gs.print(arrayUtil.diff(a1, a2));

[Manikandan Subr]

How i can use arrayUtil for the below condition?

  if (cust_arr_inc[i].indexOf(cust_arr_cr[j]) >= 0)

[vkachineni]

Let's say your incident has companies 1,2,3,4

and your CR has companies 3,4,5,6

What do you want your final companies on incident?

1,2?