遍历Node.js中的多维数组

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!

Answer 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
    }
});

Answer 2

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

Answer 3

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);