NodeJS Count how many objects in array?

Question

How would I count how many objects there are inside an array?

The array looking like:

[ {id: 1}, {id: 2}, ...]

I assume I could use count() if it was PHP, but what about NodeJS/Javascript?

Edit:

if (offer.items_to_receive.length > 0) { 
    console.log("items: " + offer.items_to_receive.length);
    for(var i = 0; i < offer.items_to_receive.length; i++) {
        usersInRound.push(offer.steamid_other);
    }
}

logData('Accepted trade offer from ' + offer.steamid_other + '. (tradeofferid: ' + offer.tradeofferid + ')\nWorth ' + offer.items_to_receive.length + ' tickets. ');

How come it can read the "worth X tickets", but not the other part?

Answer 1

Use .length

var data = [{
    id: 1
}, {
    id: 2
}];

console.log(data.length);

Update, in your edit I see that

offer.items_to_receive is undefined, ensure that object offer has property items_to_receive (should be array);

Answer 2

I think your question should be How to get Array Size in Javascript?

Answer: Use the length method.

---

Examples:

[1,2,3].length
// => 3

var a = { num: 1, obj: {}, arr: [{}, 3, "asd", {q: 3}, 1] }
a.arr.length
// => 5