How to use find objects in multiple levels of nested arrays

Question

What I want is to find an object in a nested array, and to get it by a pre-known ScheduleId number, and where the Duration property is defined.

We need to find this element which is contained inside of array of "Columns", and "Columns" are contained within "Table" elements.

After finding this object, I want to update ScheduleId = 0 and Duration = 0.

Sample data:

var data = {
    "Headers": [
        "A",
        "B",
        "C",
        "D"
    ],
    "Table": [
        {
            "Columns": [
                {
                    "Duration": 0,
                    "ScheduleId": 12,
                },
            ],
        },
        {
            "Columns": [
                {
                    "Duration": 22,
                    "ScheduleId": 44,
                },
            ],
        },
        {
            "Columns": [
                {
                    "Duration": 0,
                    "ScheduleId": 1648,
                },
            ],
        },
        {
            "Columns": [
                {
                    "Duration": 0,
                    "ScheduleId": 22,
                },
            ],
        },
    ]
};

Pseudo code:

var requestedScheduleId = 22;
var requestedObj = data.Table.find(x => requestedScheduleId.Equals(x.Columns.ScheduleId) )
requestedObj.ScheduleId = 0;
requestedScheduleId.Duration = 0;

Unsuccessful attempt:

var test = data.Table.map(({ Columns }) => {return Columns = Columns.filter(({ ScheduleId }) => ScheduleId == 22 )});

console.log(test);

Please include your code in your post, rather than a link to elsewhere. — mykaf
– mykaf, Commented Apr 13, 2022 at 19:09

Tomalak · Accepted Answer · 2022-04-16 09:40:29Z

I would not use .map or .filter for this. It's a plain and simple nested loop: For each table, for each column, if condition is met, do something.

Either with for loops:

for (table of data.Table) {
    for (column of table.Columns) {
        if (column.ScheduleId === 22) {
            column.ScheduleId = 0;
            column.Duration = 0;
        }
    }
}

or with Array#forEach:

data.Table.forEach(table => {
    table.Columns.forEach(column => {
        if (column.ScheduleId === 22) {
            column.ScheduleId = 0;
            column.Duration = 0;
        }
    });
});

var data = {
    "Headers": [
        "A",
        "B",
        "C",
        "D"
    ],
    "Table": [
        {
            "Columns": [
                {
                    "Duration": 0,
                    "ScheduleId": 12,
                },
            ],
        },
        {
            "Columns": [
                {
                    "Duration": 22,
                    "ScheduleId": 44,
                },
            ],
        },
        {
            "Columns": [
                {
                    "Duration": 0,
                    "ScheduleId": 1648,
                },
            ],
        },
        {
            "Columns": [
                {
                    "Duration": 0,
                    "ScheduleId": 22,
                },
            ],
        },
    ]
};

var requestedScheduleId = 22;

data.Table.forEach(table => {
    table.Columns.forEach(column => {
        if (column.ScheduleId === requestedScheduleId) {
            column.ScheduleId = 0;
            column.Duration = 0;
        }
    });
});

console.log(data);

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