Map nested array with JavaScript

I'm trying to map a nested array using .map(), so I could display and pinpoint all London underground locations in a map.

this.undergroundGeoJson = [
        {
            'type': 'FeatureCollection',
        'crs': { 'type': 'name', 'properties': { 'name': 
        'urn:ogc:def:crs:OGC:1.3:CRS84' } },

        'features': [
            {
                'type': 'Feature',
                'geometry': {
                    'type': 'Point',
                    'coordinates': [-0.278126, 51.5025]
                },
                'properties': {
                    'name': 'Acton Town'
                }
            },
            {
                'type': 'Feature',
                'geometry': {
                    'type': 'Point',
                    'coordinates': [-0.263033174, 51.50883531]
                },
                'properties': {
                    'name': 'Acton Central'
                }
            },
            {
                'type': 'Feature',
                'geometry': {
                    'type': 'Point',
                    'coordinates': [-0.262879534, 51.50856013]
                },
                'properties': {
                    'name': 'Acton Central'
                }
            }
       }
   ]

I need the coordinates array elements down in the geometry obj.

this is my code so far…

@computed

get undergroundLatLongs() {

return this.undergroundGeoJson.map((u) =>

[u.features.geometry.coordinates[0],

u.features.geometry.coordinates[1]]);

}

and this is the error log…

Uncaught TypeError: Cannot read property ‘coordinates’ of undefined

any help welcomed.

#javascript #arrays #reactjs