如何在javascript中读取geojson文件并获取最小或最大属性？

Question

I'm new to js sorry if it's a stupid question. I guess there is two parts to my question.

What is the simplest way to read a geojson file with javascript ?

Right now I'm using :

var centrisData = $.getJSON( "Path to geojson");

My file looks something like that:

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {
        "type": "Maison\u00a0",
        "utilisation": "null",
        "piecesBeta": "20.0",
        "price": 3995000.0,
        "prixPiece_beta": 199750.0,
      },
    },
    {
      "type": "Feature",
      "properties": {
        "type": "Condo\u00a0",
        "utilisation": "null",
        "piecesBeta": "6.0",
        "price": 448900.0,
        "prixPiece_beta": 74816.67
      }
    }

I want to be able to get the min and max of the property "price". What would be the easiest way to do so ?

Thanks in advance !

Answer 1

You can loop over all of the features and keep and store the current minimum and maximum prices as variables.

 const centrisData = { "type": "FeatureCollection", "features": [{ "type": "Feature", "properties": { "type": "Maison\ ", "utilisation": "null", "piecesBeta": "20.0", "price": 3995000.0, "prixPiece_beta": 199750.0, }, }, { "type": "Feature", "properties": { "type": "Condo\ ", "utilisation": "null", "piecesBeta": "6.0", "price": 448900.0, "prixPiece_beta": 74816.67 } } ] }; let min = Infinity, max = -min; for(const {properties: {price}} of centrisData.features){ min = Math.min(min, price); max = Math.max(max, price); } console.log("Min:", min); console.log("Max:", max);