Filter existing array for objects not appearing in a different array

Question

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]);
          });

ticketDetailsArray=the main array
ticketDetailsSubset2= the new array I want to create
excludeTickets=the array containing ticket numbers..

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.

missing return statem with curly brackets, it should be (i) => !excludeTickets.includes(i["stl19:TicketNumber"][0]) without curly or with return statement and curly brackets. — Nina Scholz
– Nina Scholz, Commented Apr 18, 2021 at 12:53

Filipe Macedo · Accepted Answer · 2021-04-18 12:58:19Z

1

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]));

edited Apr 18, 2021 at 12:58

answered Apr 18, 2021 at 12:54

Filipe Macedo

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4 Comments

Filipe Macedo Over a year ago

In this case it is difficult to know if the signature of the object is correct, but considering that it is already using this code, I am assuming that it is. In the case of the code reported by the author, what is missing is the return in the function

Richard C Over a year ago

checking 0017522827238 and return value=false checking 0017522827239 and return value=false ``` I changed it to this. ticketDetailsSubset2 = ticketDetailsArray.filter((i: any) => { console.log(

checking ${                 i["stl19:TicketNumber"][0]               } and return value=${excludeTickets.includes(                 i["stl19:TicketNumber"][0]               )}

); return !excludeTickets.includes(i["stl19:TicketNumber"][0]); }); ``` Why is the return value false for "0017522827238". it's in the exclude

Richard C Over a year ago

whoops, sorry don't know how to make the comment code in a reply obviously-duh

Richard C Over a year ago

Your direction sounds like it would work but it's not working. Which is strange. I will re-post and try and better demonstrate.

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