docs: function lookup(latitude, longitude, countryCode) {
    let minDistance = Infinity
    let city = {}
  
    // start with inout values
    const start = { latitude, longitude }
  
    // iterate through all locations
    try {
      const otherCountryOrigin = require(`../locations/${countryCode}.json`)
      otherCountryOrigin.forEach((location) => {
        const distance = haversine.distance(start, location)
        if (distance < minDistance) {
          city = location
          minDistance = distance
        }
      })
    } catch (e) {
      return undefined
    }
  
    // add distance to city object
    city.distance = minDistance
  
    // return city object
    return city
  }