CODEWITHSUNDEEP
javascriptnode.jsmongodbdestructuring
iosrat
iosrat

Reputation: 50

JavaScript destructure object into other object set default value

I am destructuring the value of an object from an array. If array is empty, error happens. How to make default value, if array is empty?

Error happens if array, which I am destructuring is empty:

"TypeError","message":"Cannot destructure property payments of 'undefined' or 'null'."

Code of destructuring (await (...).toArray() is returning array [ { payments: @integer } ]):

    ({
        [0]: { payments: users.finances.payments = 0 },
    } = await (
        await payments_collection.aggregate([
            {
                $group: {
                    _id: null,
                    payments: { $sum: '$coins' },
                },
            },
        ])
    ).toArray());

Upvotes: 0

Views: 61

Answers (1)

iosrat
iosrat

Reputation: 50

@adiga, thanks for your answer.

I replaced { [0]: { payments: users.finances.payments = 0 } } with [{ payments: users.finances.payments = 0 } = {}]

New working code:

    [{ payments: users.finances.payments = 0 } = {}] = await (
        await payments_collection.aggregate([
            {
                $group: {
                    _id: null,
                    payments: { $sum: '$coins' },
                },
            },
        ])
    ).toArray();

Upvotes: 0

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