feature累加(featureReduce)

npm install @turf/meta

Reduce features in any GeoJSON object, similar to Array.reduce(). 接收任何GeoJSON对象(包括要素集合)，遍历累加操作，类似于Array.reduce()。

参数

参数	类型	描述
geojson	(FeatureCollection|Feature|Geometry)	任意 GeoJSON 对象
callback	Function	回调，参数依次是 previousValue、currentFeature、featureIndex
initialValue	(*)	要用作回调的第一个调用的第一个参数的值。

返回

• The value that results from the reduction.

示例

var features = turf.featureCollection([
  turf.point([26, 37], {"foo": "bar"}),
  turf.point([36, 53], {"hello": "world"})
]);

turf.featureReduce(features, function (previousValue, currentFeature, featureIndex) {
  //=previousValue
  //=currentFeature
  //=featureIndex
  return currentFeature
});