Compare two arrays and return unmatched elements in both arrays?

[Shantharao]

Hello Experts,

I have a list collector field on the Change Request form which references to sys_user_group table
For example, the current field holds three groups called "A, B, and C" now I have added "D, E" groups manually 
Previous list collector fields array values = [A, B, C]
Current list collector fields array values = [A, B, C, D, E]
The requirement is to fetch newly added groups and post them in the change request audit history, so in the current scenario D, E should be set to "work_notes" field

Scenario: I want to compare the current list array values with the previous list array and need to fetch unmatched array values
I have used the below logic but not working as expected 

var currentAuthorizationApproval = current.u_authorization_approval_groups.toString().split(",");
var previousAuthorizationApproval = previous.u_authorization_approval_groups.toString().split(",");

var final1 = getMatch(currentAuthorizationApproval, previousAuthorizationApproval);
gs.addInfoMessage(" final=>" + final1);

function getMatch(a, b) {
var matches = [];

for (var i = 0; i < a.length; i++) {
for (var e = 0; e < b.length; e++) {
if (a[i] != b[e]){
matches.push(a[i]);
gs.addInfoMessage("a[i]=>" +a[i]);
}
}
}
return matches;
}

[Chinmay Tawade1]

Hi Shantharao,

Try the below code in function -

function getMatch(a, b) {
var matches = [];

for (var i = 0; i < a.length; i++) {
for (var e = 0; e < b.length; e++) {
if (a[i] != b[e]){
matches.push(a[i].toString());
gs.addInfoMessage("a[i]=>" +a[i]);
}
}
}
return matches;
}

Please mark this answer as Helpful if this works.

Thanks,

Chinmay

[Shantharao]

Hi Chinmay,

I have tried pushing as a string but no luck, is there any other way to fix this issue

Thanks

[RaghavSh]

Try using Array Utils from servicenow

https://developer.servicenow.com/print_page.do?release=quebec&category=null&identifier=c_ArrayUtilAP... 

[kamlesh kjmar · Accepted solution]

Hi @Shantharao ,

Below code should work:

var currentAuthorizationApproval = current.getValue("u_authorization_approval_groups").split(",");
var previousAuthorizationApproval = previous.getValue("u_authorization_approval_groups").split(",");
var arrayUtil = new ArrayUtil();
var final1 = arrayUtil.diff(currentAuthorizationApproval , previousAuthorizationApproval )
gs.addInfoMessage(" final=>" + final1);

I Hope this helps.

Please mark this helpful if this helps and Accept the solution if this solves your issue.

Regards,

Kamlesh