Iterate an array and check objects with filter and skip the null values

Question

So I'm iterating an array with objects and checking for a specific id, and this works fine when It has an id, but some time that is null and when it is it throws an error can't read properties of null or something similar.

Here is my function, and I would like to check the case, if it is null then just skip and don't iterate that object so I can avoid that error:

Here is the function:

const d = vehicles.vehicles.filter((vehicle) => vehicle.owner._id === quick.temp.customer._id);

vanowm · Accepted Answer · 2022-03-26 18:37:06Z

3

You can add a simple check if variable is an object:

const d = vehicles.vehicles.filter((vehicle) => vehicle && vehicle.owner && vehicle.owner._id === quick.temp.customer._id);

This might fail if vehicle.owner is anything non-null and not an object, but you can further expand it to check the type vehicle.owner instanceof Object

With ES6 you can use optional chaining: ?

const d = vehicles.vehicles.filter((vehicle) => vehicle?.owner?._id === quick.temp.customer._id);

It's a little slower though.

And finally you can wrap the condition into try{}catch(e){} than you don't have to worry about errors:

const d = vehicles.vehicles.filter((vehicle) =>
{
  try
  {
    return vehicle.owner._id === quick.temp.customer._id
  }
  catch(er){}
});

This method is the slowest of them all https://jsbench.me/zzl1871t5u/1

edited Mar 26, 2022 at 18:37

answered Mar 26, 2022 at 13:49

vanowm

10.4k2 gold badges29 silver badges50 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

cutrimafyi Over a year ago

And how can you do that, I mean to check the owner one because its the same I think

Collectives™ on Stack Overflow

Iterate an array and check objects with filter and skip the null values

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related