Loop through multidimensional array in Node.js

Question

Hey I got this object inside polygons.js:

var polygons = [
  {
    "_id" : "12345",
    "geometry" : {
       "coordinates" : [[
           [9.123553, 48.71568],
           [ 9.119548, 48.71526 ]
       ]]
    }
  },
  {
    "_id" : "67890",
    "geometry" : {
       "coordinates" : [[
           [ 9.090445, 48.715736 ],
           [ 9.089583, 48.715687 ]
       ]]
    }
  }
]

I want to loop through this array in order to get a result like this:

[
  { 
    "_id" : "12345",
    "coordinates" : [[
      [9.123553, 48.71568],
      [ 9.119548, 48.71526 ]  
    ]]
  },
  { 
    "_id" : "67890",
    "coordinates" : [[
      [ 9.090445, 48.715736 ],
      [ 9.089583, 48.715687 ]  
    ]]
  }
]

Does anyone have an idea how to solve it? Thank you very much in regard!

Look into Array.map.

Jeto
– Jeto

2018-09-26 19:16:01 +00:00
Commented Sep 26, 2018 at 19:16 — Jeto
– Jeto, Commented Sep 26, 2018 at 19:16

Eduardo Junior · Accepted Answer · 2018-09-26 19:18:03Z

1

you can map through the array and make the changes you need

formatted_polygons = polygons.map(function(polygon){
    return {
        coordinates : polygon.geometry.coordinates,
        _id : polygon._id
    }
});

answered Sep 26, 2018 at 19:18

Eduardo Junior

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4 Comments

1989_lea Over a year ago

when I run the code, it gets me this output: { _id: '12345', coordinates: [ [Array] ] }, { _id: '67890', coordinates: [ [Array] ] }

Eduardo Junior Over a year ago

What functionality of polygon.js are you trying to use ?

1989_lea Over a year ago

I want to prepare a rest api endpoint that returns the data like this. polygon.js is a json dump I have to use

Eduardo Junior Over a year ago

Have you tried JSON.stringify( formatted_polygons ) ?

Francisco Di Giandomenico · Accepted Answer · 2018-09-26 19:16:15Z

0

Seems like you're just trying to get rid of the "geometry" prop and get the "coordinates" directly?

polygons.map(polygon => ({ _id: polygon._id, coordinates: polygon.geometry.coordinates }))

Should achieve what you're looking for

answered Sep 26, 2018 at 19:16

Francisco Di Giandomenico

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Comments

amrender singh · Accepted Answer · 2018-09-26 19:16:58Z

0

You can simply use Array.map():

var polygons = [ { "_id" : "12345", "geometry" : { "coordinates" : [[ [9.123553, 48.71568], [ 9.119548, 48.71526 ] ]] } }, { "_id" : "67890", "geometry" : { "coordinates" : [[ [ 9.090445, 48.715736 ], [ 9.089583, 48.715687 ] ]] } } ];

let result = polygons.map(({_id,geometry})=>Object.assign({},{_id, coordinates :geometry.coordinates}));
console.log(result);

answered Sep 26, 2018 at 19:16

amrender singh

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2 Comments

1989_lea Over a year ago

Thanks for your solution, when I run this code cannot see whats inside the coordinates-array. it only logs this: [ { _id: '12345', coordinates: [ [Array] ] }, { _id: '67890', coordinates: [ [Array] ] }] I had this issue before, I still can't resolve it

amrender singh Over a year ago

@LeaHontiveros is there any adjacent to the coordinates, if it is there than please click on the arrow to expand the array. You will be able to see the elements of the array after that. :-) and please mark as accepted if it worked for you.

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