Query array of objects and set value

Question

I have an array of objects that looks like this:

[
    {
        "e_id": "1",
        "total": 0
    },
    {
        "e_id": "3",
        "total": 0
    }
]

Within a forEach loop, I want to increment the total value depending on the e_id. I have been trying something like this:

e.forEach((row) => {
    this.arrayObj[row.e_id]['total']++;
});

But this does not work as I think it is using the e_id as an index as opposed to a reference.

Is there a way this can work?

What is `e` here? You probably need `this.arrayObj.find(o => o.e_id === row.e_id)?.total++` — adiga, May 11 '21 at 14:33
[Find object by id in an array of JavaScript objects](https://stackoverflow.com/questions/7364150) — adiga, May 11 '21 at 14:34

score 1 · Answer 1 · answered May 11 '21 at 14:33

1

e=[
    {
        "e_id": "1",
        "total": 0
    },
    {
        "e_id": "3",
        "total": 0
    }
]

e.forEach((row) => {
    row['total']++;
});

Do you need this?

answered May 11 '21 at 14:33

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Query array of objects and set value

1 Answers1