JavaScript: iterating over an array of objects containing nested arrays

Within my leaflet project, I created a function that accepts an array containing objects, each of which holds an array of markers and an ID to distinguish the group.

Here is the sample array:

var markerGroupArray = [
{ features: [L.marker([39.61, -105.02]).bindPopup('This is Littleton, CO.'),
L.marker([39.74, -104.99]).bindPopup('This is Denver, CO.'),
L.marker([39.73, -104.8]).bindPopup('This is Aurora, CO.'),
L.marker([39.77, -105.23]).bindPopup('This is Golden, CO.')], id: 'Group 1'},

{ features: [L.marker([39.51, -105.02]).bindPopup('Somewhere else'),
L.marker([39.64, -104.99]).bindPopup('Somewhere else'),
L.marker([39.63, -104.8]).bindPopup('Somewhere else'),
L.marker([39.67, -105.23]).bindPopup('Somewhere else')], id: 'Group 2'}
];

This array is used as input for the following function:

addOverlayMap: function (overlayMapArray) {
    for (var i = 0; i < overlayMapArray.length; i++)
    {
        var layerGroup = L.layerGroup();

        for (var j = 0; j < overlayMapArray[i][features].length; j++)
        {
            layerGroup.addLayer(overlayMapArray[i][features][j]);
        }

        this.overlayMapObject[overlayMapArray[i][id]] = layerGroup;
    }
    this.refreshLayerControl();
}

I encounter an error stating that the "features" key is not defined. What could be causing this issue?

Answer №1

overlayMapArray[i][features].length
should be
overlayMapArray[i].features.length
without the brackets around features. Alternatively, you can use
overlayMapArray[i]['features'].length
in JavaScript.

The current code is attempting to use the value of a variable named features, which does not exist, resulting in a ReferenceError. By changing to either a literal form (first suggestion) or bracket notation with a string (second suggestion), you are explicitly specifying the property name features.

Answer №2

Give this a shot:

overlayMapArray[i]['features']

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