Searching for a specific bus stop within an array based on a designated route

There's an issue at hand.

We have a route with several bus stops.

We need to determine the next stop on this route.

The "_stopNum": "1" indicates that the stop is the first one on the route.

Take a look at a stop example:

{
  "route": [
    {
      "_transport": "regionalbus",
      "_num": "146",
      "_direction": "b-a",
      "_directionName": "Nõva - Harju-Risti - Padise - Ämari - Keila - Harku - Tallinn",
      "_stopNum": "1"
    }
  ],
  "_id": "5701054-1",
  "_id0": "134773",
  "_name": "Laimi",
  "_lat": "59.22155",
  "_lon": "23.67992"
}

You can refer to the scheme I created here to better understand the problem.

Additionally, check out a snapshot of a portion of the array here.

I attempted to use the .find function but struggled to search for an object within an array of objects inside another object in an array of objects. Apologies for the confusion.

javascriptarraysjsonobjectfind

Answer №1

// start by gathering all stops from your array
let busStops = routeData.map(stop => stop.route).flat()

// create a function to locate the next stop after a given stop
function findNextStop(currentStop) {
  // find the stop with the same route number (_num) and a stop number that is one greater
  return busStops.find(element => element._num === currentStop._num 
         && parseInt(currentStop._stopNum) + 1 == element._stopNum);
}

Simply use the findNextStop() function and input the currentStop. You can adjust the search criteria in the find() according to your requirements, such as filtering by direction as well.

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