flattenReduce

Reduce flattened features in any GeoJSON object, similar to Array.reduce().
在GeoJSON对象中减少扁平feature，类似于Array.reduce()。

> npm install @turf/meta

参数

参数	类型	描述
geojson	(FeatureCollection|Feature|Geometry)	任何 GeoJSON 对象
callback	Function	a method that takes (previousValue, currentFeature, featureIndex, multiFeatureIndex)
initialValue	(*)	Value to use as the first argument to the first call of the callback.

返回

• • The value that results from the reduction.

示例

var features = turf.featureCollection([
    turf.point([26, 37], {foo: 'bar'}),
    turf.multiPoint([[40, 30], [36, 53]], {hello: 'world'})
]);

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