加入并嵌套两个关联数组/ geoJSON文件

Question

我有两个geoJSON文件，我想为D3可视化嵌套。这个问题同样适用于javascript中的两个关联数组/对象。这是最简洁的方式吗？如何从用于第二个数组的变量名生成密钥名称[“communities”]？这使用下划线/ lodash函数_.where（）。因为我使用d3是有一种方法来做到这一点没有lo-dash依赖（不是必要的，但如果有一个内置的d3函数来做到这一点，更好）。

var nationalities = [{
    "type": "Feature",
    "properties": {
      "nationality": "Cofan"
    },
    "geometry": null
  }, {
    "type": "Feature",
    "properties": {
      "nationality": "Secoya"
    },
    "geometry": null
  }
];

var communities = [{
    "type": "Feature",
    "properties": {
      "community": "Dureno",
      "nationality": "Cofan"
    },
    "geometry": null
  }, {
    "type": "Feature",
    "properties": {
      "community": "Zabalo",
      "nationality": "Cofan"
    },
    "geometry": null
  }, {
    "type": "Feature",
    "properties": {
      "community": "Duvono",
      "nationality": "Cofan"
    },
    "geometry": null
  }
];


var nested = nest(nationalities, communities, "nationality");

console.log(nested);

function nest(array1, array2, id) {
  var filterFunc = function(feature) { 
    return function(d) {
      return feature.properties[id] === d.properties[id];
    };
  };

  array1.forEach(function(feature) {
    feature.properties["communities"] = _.filter(array2, filterFunc(feature));
  })

  return array1;
}