Array.indexOf Not working

Question

I have an angularJS/Typescript application where I am trying to check if an object is already in a current list of objects

     if (this.selectedFormatData.indexOf(item) === -1) {
            //doesn't exist so add
            this.selectedFormatData.push(item);
        } else {
            this.selectedFormatData.splice(this.selectedFormatData.indexOf(item), 1);
        }

I have used this code before and it worked but isn't in this instance. Console output suggests it should work?

Any ideas?

Console display for objects

Update: yeah correct looks like a duplicate sorry. I had a previous bit of code where i thought it worked because it was returning 0 instead of -1. Not sure why it would return 0 though

enter image description here

What does "not working" mean, exactly? – Blackhole Jun 16 '15 at 12:58 — Blackhole, Jun 16 '15 at 12:58
indexOf does not match objects... – epascarello Jun 16 '15 at 12:59 — epascarello, Jun 16 '15 at 12:59
I don't think index of is meant for array of objects. – Lau Jun 16 '15 at 13:04 — Lau, Jun 16 '15 at 13:04

score 0 · Answer 1 · edited May 23 '17 at 10:32

0

As the comments state, indexOf() is not meant to compare objects. This has been answered before here: Why Array.indexOf doesn't find identical looking objects.

edited May 23 '17 at 10:32

Community

1
1

answered Jun 16 '15 at 13:07

Nicolas Peckman

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6

If it has been answered before, please flag this question as a duplicate instead of answering it again. – Blackhole Jun 16 '15 at 13:09
Sorry, I don't have the reputation to flag yet. Won't do it again. – Nicolas Peckman Jun 16 '15 at 13:11

Array.indexOf Not working

1 Answers1