How to find if arrays have matching objects?

Question

I need to loop 2 arrays and see if they have matching objects and if so, add a marker to a map and when i click on it I want to tell the number of total results for matching coordinates which in the following example would be 2. The marker is fine as I am looping the arrays and placing it based on the coordinates but I can't give the total number currencies within the same coordinates.

Therefore I have:

latitude = [{"45.99"},{43.22},{"45.99"}];

longitude = [{"9.22"},{"2.645"},{"9.22"}];

This answer helps a bit, basically it uses filter but what I would like to do is to check if both arrays have any matching values and place the number of results in a modal.

Currently I do:

$("#results .modal-body").html("Risultati"+" " +longitude.length + "<button id='goToResul' type='button' class='btn btn-danger'>Go to result</button>");

But that would check the length of the whole longitude array while in the arrays example we have twice 45.99 and 9.22 which means 2 matches.

What might helps is that both longitudes and latitudes follow the same index

@ACD why not? we have twice 45.99 and 9.22 which means 1 match — downFast
– downFast, Commented Nov 7, 2018 at 5:51
And latitude = [{"45.99"},{43.22},{"45.99"},{43.22}]; longitude = [{"9.22"},{"2.645"},{"9.22"}]; would be? — ACD
– ACD, Commented Nov 7, 2018 at 5:54
@ACD I don't want to find a latitude or a longitude, I want to find the number of total results for matching coordinates which in this case would be 1 — downFast
– downFast, Commented Nov 7, 2018 at 5:55

Nitish Narang · Accepted Answer · 2018-11-07 06:26:18Z

1

As per my understanding, you can try below approach

var lat = ["45.99","43.22","45.99", "45.99"]
  , lng = ["9.22","2.645","9.22", "9.22"]
  , latlngCount = Object.entries(lat.reduce((o, d, i) => (o[lat[i]+'-'+lng[i]] = (o[lat[i]+'-'+lng[i]] || 0) + 1, o) , {})).filter(([latlng, count]) => count > 1)
  , matchingCount = latlngCount.reduce((sum, [latlng, count]) => sum + count, 0)

console.log('Matching lat lng', latlngCount)
console.log('Matching Count', matchingCount)

edited Nov 7, 2018 at 6:26

answered Nov 7, 2018 at 6:24

Nitish Narang

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FZs · Accepted Answer · 2018-11-07 14:19:03Z

0

Do you mean something like this?

count=0
latitude = ["45.99","43.22","45.99"];
longitude = ["9.22","2.645","9.22"];
lat=latitude.concat([])
long=longitude.concat([])
for(i in latitude){
  lat.shift()
  long.shift()
  if((index=lat.indexOf(latitude[i]))!==-1){
    if(long[index]==longitude[i]){
      //DO SOMETHING IF A PAIR IS FOUND
      count++
    }
  }
}
console.log(count)

edited Nov 7, 2018 at 14:19

answered Nov 7, 2018 at 6:17

FZs

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2 Comments

downFast Over a year ago

what would it be the result of this?

FZs Over a year ago

@downFast this have a section (marked by the comment in code) what you need to replace with something, what you want to do for each pairs

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