CODEWITHSUNDEEP
javascriptarrays
Richard C
Richard C

Reputation: 171

Filter existing array for objects not appearing in a different array

I am a newbie and I am trying to create a new array from an existing array but only keep the object when a property of the object doesn't appear in another array...

 ticketDetailsSubset2 = ticketDetailsArray.filter((i) => {
            !excludeTickets.includes(i["stl19:TicketNumber"][0]);
          });

If the i["stl19:TicketNumber"][0] is in the exclude Tickets array then don't include it in the new array...

Here's the array of exclude Tickets..

[Array(1)]0: ["0017522827238"]

The array of ticket Details Array is pretty big but here's a snippet...

0: {$: {…}, stl19:OriginalTicketDetails: Array(1), stl19:TransactionIndicator: Array(1), stl19:TicketNumber: Array(1), stl19:PassengerName: Array(1), …}
1: {$: {…}, stl19:OriginalTicketDetails: Array(1), stl19:TransactionIndicator: Array(1), stl19:TicketNumber: Array(1), stl19:PassengerName: Array(1), …}
2:
$: {id: "90", index: "3", elementId: "pnr-90"}
stl19:AgencyLocation: ["29JB"]
stl19:AgentSine: ["A46"]
stl19:DutyCode: ["*"]
stl19:OriginalTicketDetails: ["TE 0017522827239-AT YOASH/N 29JB*A46 1439/16APR "]
stl19:PassengerName: ["CLAUS/M"]
stl19:PaymentType: [""]
stl19:TicketNumber: ["0017522827239"]
stl19:Timestamp: ["2021-04-16T14:39:00"]
stl19:TransactionIndicator: ["TE"]

The problem is the array returned has no rows. At least one of the stl19:TicketNumber is NOT in the exclude Tickets array and therefore should be returned. If the condition is false I wanted the object returned. There's no error but it's not evaluating the filter with the condition clause. I'm a beginner so sorry if this is a js 101 question.

Upvotes: 0

Views: 51

Answers (1)

Filipe Macedo
Filipe Macedo

Reputation: 26

The filter function expects to receive a function in the parameter that returns a boolean.

If you want to know more about the filter function click here

Looking at your code, we can see that you passed a void callback function (which has no return), I believe that the example below solves your problem:

 ticketDetailsSubset2 = ticketDetailsArray.filter((i) => {
   return !excludeTickets.includes(i["stl19:TicketNumber"][0]);
 });

You can also use an arrow function, sample code:

ticketDetailsArray.filter((i) => !excludeTickets.includes(i["stl19:TicketNumber"][0]));

Upvotes: 1

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