What is the best way to organize two separate arrays based on a single shared variable?

Question

What is the best way to organize two separate arrays based on a single shared variable?

I have two separate arrays containing information. One array includes the title of each national park and other related data, while the second array consists of alerts from the entire NPS system. The common factor between these arrays is the parkCode. How can I organize them by national park? For instance:

Yellowstone National Park - alert from Yellowstone
Arches National Park - alert from Arches

Here is a snippet of the data I am dealing with:

National Park Names:

 0:
 description: "."
 designation: "National Park"
 directionsInfo: "From Boston take I-95 north to Augusta, Maine, then 
 Route 3 east to Ellsworth, and on to Mount Desert Island. For an 
 alternate route, continue on I-95 north to Bangor, Maine, then take 
 Route 1A east to Ellsworth. In Ellsworth, take Route 3 to Mount Desert 
 Island."
 directionsUrl: "http://www.nps.gov/acad/planyourvisit/directions.htm"
 fullName: "Acadia National Park"
 id: "6DA17C86-088E-4B4D-B862-7C1BD5CF236B"
 latLong: "lat:44.30777545, long:-68.30063316"
 name: "Acadia"
 **parkCode: "acad"**
 states: "ME"
 url: "https://www.nps.gov/acad/index.htm"

Example Alert:

113:
category: "Park Closure"
description: "The Elwha area is closed indefinitely to vehicle traffic 
beyond Madison Falls parking lot due to extensive flood damage to the 
Olympic Hot Springs Road. There is limited parking and turnaround space 
at the Madison Falls parking area."
id: "84646EA9-1DD8-B71B-0BD7AECDC56BD8AE"
**parkCode: "acad"**
title: "Elwha (Olympic Hot Springs) Road Closed to Vehicle Access"
url: "https://www.nps.gov/olym/planyourvisit/current-road-conditions.htm"

javascript arrays json

Answer 1

Answer №1

If your alerts are stored as JavaScript objects in an array named alerts, you can categorize them by park in the following way:

const alertsByPark = {};
alerts.forEach(alert => {
  // Check if there are any alerts already recorded for this park, if not, add the park as a key to the alertsByPark object
  if (!alertsByPark[alert.parkCode]) alertsByPark[alert.parkCode] = [];
  alertsByPark[alert.parkCode].push(alert);
});

The data structure of alertsByPark will now look like this:

{
  acad: [...],
  ...
}

Each parkCode has a corresponding key with an array containing all alerts from that park.

To display the data in the format shown in your query, where each alert is listed under the formal name of the park referenced by its parkCode, you can use the find method on the parks array to retrieve complete park information based on the parkCode mentioned in the alert.

alerts.forEach((alert, i) => {
  // Find the park with the parkCode matching the alert's parkCode
  const park = parks.find(({ parkCode }) => parkCode === alert.parkCode);
  console.log(`${i}. ${park.fullName} - ${alert.description}`);
})

This assumes you have the alerts stored in an array called alerts and the parks in an array named parks. The output will be in a format similar to:

1. Acadia National Park - The Elwha area is closed indefinitely to...
2. park name - alert description

and so on.

Answer 2

If your alerts are stored as JavaScript objects in an array named alerts, you can categorize them by park in the following way:

const alertsByPark = {};
alerts.forEach(alert => {
  // Check if there are any alerts already recorded for this park, if not, add the park as a key to the alertsByPark object
  if (!alertsByPark[alert.parkCode]) alertsByPark[alert.parkCode] = [];
  alertsByPark[alert.parkCode].push(alert);
});

The data structure of alertsByPark will now look like this:

{
  acad: [...],
  ...
}

Each parkCode has a corresponding key with an array containing all alerts from that park.

To display the data in the format shown in your query, where each alert is listed under the formal name of the park referenced by its parkCode, you can use the find method on the parks array to retrieve complete park information based on the parkCode mentioned in the alert.

alerts.forEach((alert, i) => {
  // Find the park with the parkCode matching the alert's parkCode
  const park = parks.find(({ parkCode }) => parkCode === alert.parkCode);
  console.log(`${i}. ${park.fullName} - ${alert.description}`);
})

This assumes you have the alerts stored in an array called alerts and the parks in an array named parks. The output will be in a format similar to:

1. Acadia National Park - The Elwha area is closed indefinitely to...
2. park name - alert description

and so on.

Answer 3

Answer №2

parks.map(park => {
 park.alerts = alerts.filter(alert => alert.parkCode === park.parkCode)
 return park
})

This code snippet generates a parks array with an additional property 'alerts' that contains an array of corresponding alerts.

For example:

const parks = [
 { name: 'Yellowstone', parkCode: 'ys' },
 { name: 'Arcadia', parkCode: 'ar' },
 { name: 'Arches', parkCode: 'arch' },
 { name: 'A park without alerts', parkCode: 'PARK' }
 ]

const alerts = [
 { description: 'Alert 1', parkCode: 'ys' },
 { description: 'Alert 2', parkCode: 'ys' },
 ...
]

 let parksWithAlerts = parks.map(park => {
   park.alerts = alerts.filter(alert => alert.parkCode === park.parkCode)
   return park
 })

 console.dir(parksWithAlerts[0])

{ name: 'Yellowstone',
  parkCode: 'ys',
  alerts:
   [ { description: 'Alert 1', parkCode: 'ys' },
   ...
   ] }

Merged alerts

let parksWithAlerts = parks.map(park => {
   park.alerts = alerts.filter(alert => alert.parkCode === park.parkCode)
   return park
 }).map(park =>{
    park.alerts = park.alerts.map(alert => alert.description).join(' - ')
    return park
 })

console.dir(parksWithAlerts[0])

{ name: 'Yellowstone',
  parkCode: 'ys',
  alerts: 'Alert 1 - Alert 2 - Alert 3  - Alert 4 - Alert 7 - Alert 9 - Alert 10 - Alert 12 - Alert 15' }

Answer 4

parks.map(park => {
 park.alerts = alerts.filter(alert => alert.parkCode === park.parkCode)
 return park
})

This code snippet generates a parks array with an additional property 'alerts' that contains an array of corresponding alerts.

For example:

const parks = [
 { name: 'Yellowstone', parkCode: 'ys' },
 { name: 'Arcadia', parkCode: 'ar' },
 { name: 'Arches', parkCode: 'arch' },
 { name: 'A park without alerts', parkCode: 'PARK' }
 ]

const alerts = [
 { description: 'Alert 1', parkCode: 'ys' },
 { description: 'Alert 2', parkCode: 'ys' },
 ...
]

 let parksWithAlerts = parks.map(park => {
   park.alerts = alerts.filter(alert => alert.parkCode === park.parkCode)
   return park
 })

 console.dir(parksWithAlerts[0])

{ name: 'Yellowstone',
  parkCode: 'ys',
  alerts:
   [ { description: 'Alert 1', parkCode: 'ys' },
   ...
   ] }

Merged alerts

let parksWithAlerts = parks.map(park => {
   park.alerts = alerts.filter(alert => alert.parkCode === park.parkCode)
   return park
 }).map(park =>{
    park.alerts = park.alerts.map(alert => alert.description).join(' - ')
    return park
 })

console.dir(parksWithAlerts[0])

{ name: 'Yellowstone',
  parkCode: 'ys',
  alerts: 'Alert 1 - Alert 2 - Alert 3  - Alert 4 - Alert 7 - Alert 9 - Alert 10 - Alert 12 - Alert 15' }

What is the best way to organize two separate arrays based on a single shared variable?

Answer №1

Answer №2

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