tracts = {
const tracts = topojson.feature(tractsTopoJSON, tractsTopoJSON.objects[topojsonObj])
tracts.features = tracts.features.map(d => ({
...d,
properties: {
change: Number(d.properties[`${category}_c`]),
lq2015: Number(d.properties[`${category}_15`]),
quintile: d.properties.quintile
}
}))
return tracts
}